Book summary “No God but one”: summary

Introduction

You face a profound dilemma when your religious convictions clash with your closest relationships and cultural heritage. The transition from one absolute worldview to another demands a rigorous examination of historical facts, sacred texts, and theological doctrines. You often find yourself caught between deeply ingrained traditions and the persistent pull of competing truth claims.

A rigorous comparative examination reveals that the historical evidence strongly supports the Christian claims of Jesus' deity, crucifixion, and resurrection over Islamic theology.

Nabeel Qureshi guides you through a systematic comparison of Islam and Christianity. You examine religious identity, the nature of God, textual preservation, the lives of the founders, and historical evidence. The book addresses several fundamental questions to help you navigate this spiritual journey:

• How do Islam and Christianity fundamentally differ in their approaches to salvation?
• What are the core theological divides between tawhid and the Trinity?
• How do the historical origins and textual transmission of the Quran and the Bible compare?
• What do historical sources reveal about the lives and methods of Muhammad and Jesus?
• How can you objectively weigh the historical evidence for the crucifixion and resurrection?

1. Defining Religious Identity and Core Differences

You must define religions through their historical inception and founding narratives rather than contemporary behavior. Religious definitions become a moving target if you judge them solely by modern adherents. Islam should be defined by the traditional narrative of assenting to Muhammad as a prophet and following his early teachings. Christianity is defined by holding to the monotheism of the Hebrew Bible while following the divine, risen Jesus as understood in its early identity formation.

Converts from Islam to Christianity often face extreme personal danger, including the threat of death for apostasy and blasphemy in restrictive regions.

Sara Fatima al-Mutairi, a twenty-six-year-old Saudi woman who signed online forums as Rania, faced a death threat from her brother after he discovered she had converted to Christianity. Her brother was a member of the Commission for the Promotion of Virtue and the Prevention of Vice. At 5:15 a.m., July 24, 2008, a time stamp recorded a frantic forum post before she vanished from public view.

Sharia Versus the Gospel

The fundamental structural difference between Islam and Christianity is that Islam offers a law to follow to earn paradise, whereas Christianity offers a person who provides eternal life through grace.

In Islam, salvation is attained by submitting to Allah and following sharia, which is a comprehensive code of laws. In Christianity, mankind is saved by the gospel. You learn that humans are powerless due to sin and that God Himself came in the person of Jesus to pay for sins and transform hearts through agape love. Islamic belief and practice are structurally organized around core theological tenets known as the aqeeda and sharia:

• Six Articles of Faith
• Five Pillars of Islam

The Six Articles of Faith comprise beliefs in Allah's absolute unity, prophets, divinely inspired books, angels, the day of judgment, and predestining sovereignty. The Five Pillars are the shahada, five daily prayers, Ramadan fasting, almsgiving, and the pilgrimage to Mecca. You see these detailed further in hadith literature, fatawa issued by fuqaha, and teachings led by an imam following ijma.

The Medical Diagnosis Analogy

Just like undiagnosed clinical depression prevents proper treatment, misdiagnosing the fundamental problem of humanity leads to ineffective spiritual remedies.

The author volunteered with Physicians for Peace educating young mothers along the Rio Ozama in Santo Domingo. He trained resource mothers to diagnose postpartum depression, showing that naming the real disease is necessary for healing.

Islam misdiagnoses humanity's core problem as mere ignorance curable by law. Christianity correctly diagnoses it as a deep-seated spiritual brokenness requiring heart transformation by God.

2. Comparing Tawhid and the Trinity

While Islam insists on an absolute monad through tawhid, Christianity defines God as one being in three distinct persons.

Both tawhid and the Trinity were forged through internal religious debates. The Quran and Jesus serve as conceptual analogues as the physical expressions of an eternal God. In Islam, the Quran is considered the eternal Word of God expressed in the physical world. This creates a theological challenge under tawhid regarding how something separate from Allah can be eternal without violating His absolute unity. Christianity resolves this through the Trinity, where Jesus is the eternal Word and Yahweh exists as three persons in one being.

The Trinity and Quantum Complexity

Being refers to what a person is, while personhood refers to who someone is. While human beings are one being in one person, God is one being, Yahweh, existing in three persons: Father, Son, and Holy Spirit. Human reason cannot dictate God's nature, which must be understood through divine revelation.

Discoveries by physicists like Max Planck, Albert Einstein, Niels Bohr, Erwin Schrödinger, and Paul Dirac proved that subatomic particles can exist in multiple states simultaneously, defying classical reason. Similarly, the complexity and counterintuitive nature of the Trinity do not invalidate it, as the Creator must be greater than human comprehension. In the 1920s, quantum mechanics revolutionized physics. John Polkinghorne shared how Paul Dirac used a piece of chalk broken in two to explain to Cambridge students that in the quantum world, an electron can exist in mixtures of states rather than just classical here or there positions.

Because tawhid presents Allah as an absolute monad who was entirely alone in eternity past, Islamic theology inadvertently makes Allah's relational attributes contingent upon and dependent on His creation. Islam teaches that Allah possesses relational attributes such as being Gracious and Merciful, yet these qualities cannot be truly exercised without creation to receive them. Conversely, the triune God is inherently self-sufficient and relational because the three persons of the Trinity have eternally loved one another without depending on the universe.

The Hebrew word for one used in the Jewish shema, echad, frequently denotes a composite unity rather than an absolute monad. In the Old Testament, the word echad describes things that are singular units composed of multiple elements, such as evening and morning making one day, a cluster of grapes, two joining sticks, or a man and woman becoming one flesh. This Hebrew terminology aligns with the concept of a triune God.

Council of Nicaea and Incarnation

The Christian doctrine of the Trinity provides a transcendent, robust foundation for selfless altruism because love is intrinsic to the nature of a triune God. Atheistic altruism is ultimately sentimental, utilitarian, or selfishly tied to evolutionary survival. While Islamic theism offers grounded altruism through obedience to divine commands, Christianity goes further by asserting that humans are made in the image of a God whose very essence is self-sacrificial, eternal love.

In April 2015, Nabeel Qureshi spoke at a college chapel service in upstate New York. A woman asked whether Christians and Muslims worship the same God, leading to a discussion on how the Trinity grounds altruism. Following the service, an Iraqi woman approached to share how she converted to Christianity after seeing Jesus in a dream.

The Council of Nicaea was convened in AD 325 not to invent the deity of Jesus or select biblical books, but to address the Arian controversy regarding the exact nature of Christ's divinity. Emperor Constantine invited eighteen hundred bishops to Nicaea, of whom 318 attended, many bearing severe scars and disabilities from the recent persecutions under Diocletian and Licinius. Over 99 percent of the attending bishops rejected Arius's teaching that Jesus was a created subordinate god and affirmed that Jesus is of the very nature of God. Eusebius and Theodoret recorded that attendees included bishops such as Paul of Neo-Caesarea, whose hands were destroyed by red-hot irons, and Paphnutius of Egypt, who had his eyes gouged out for refusing to renounce his faith.

In February AD 303, Emperor Diocletian ordered the destruction of churches and scriptures. In October AD 312, Constantine marched into battle after a vision of the cross. Constantine then issued the Edict of Milan in AD 313 granting religious freedom.

Unlike Islamic theology which views Allah as permanently sequestered behind a veil, biblical theology records repeated theophanies culminating in the incarnation where God enters human history. The Old Testament is filled with instances of God appearing physically among His people, such as walking with Adam, talking with Abraham, walking with Moses, and leading the Israelites as a pillar of fire. In Christianity, these foreshadowings are fulfilled when the eternal Word, the Logos, takes on human nature through the hypostatic union.

Conflating Jesus in Christianity with Muhammad in Islam overlooks the fundamental distinction between divine incarnation and human prophethood. In Islam, Muhammad functions as the perfect human exemplar and chief prophet through whom sharia is derived, but he remains merely a creature. In Christianity, Jesus is not just a prophet or teacher, but the second person of the Trinity incarnate, making the person of Jesus the direct object of Christian worship. Within a few centuries of Muhammad's death, 500,000 hadith accounts were in broad circulation.

3. Scripture Status and Textual Preservation

Muslims view the Quran as the uncreated eternal speech of God, whereas Christians view the Bible as an inspired written record with independent textual transmission.

You can observe the different statuses of these holy books in public reactions. In April 2011, twenty thousand demonstrators gathered in Mazar-e-Sharif, leading to a riot where twelve people were killed following the burning of a Quran in Florida. In contrast, when the US government burned Bibles at Bagram Airfield in 2009 because they were considered trash, no Christian riots or murders occurred.

Comparing Scripture Status

While Christians view the Bible as an inspired written record composed by human authors, Muslims view the Quran as the eternal, uncreated speech of Allah. The Quran is believed by Muslims to be the literal, eternal Word of Allah inscribed on a heavenly tablet and dictated to Muhammad through Gabriel over twenty-three years, making it functionally equivalent to the Incarnation of Jesus in Christianity.

The Quran contains 114 suras, featuring both Meccan passages and Medinan passages, along with concepts like tawhid, abrogation, and hadith. The Bible comprises sixty-six books written by approximately forty people over fifteen hundred years, incorporating the Tanakh. Traditional Muslims view Arabic as the language of heaven, whereas Christians readily translate the Bible into any language without fear of losing its mystical value.

Textual Preservation History

Islamic apologists frequently challenge the Bible with alleged contradictions and corruption, largely because they project the Quran's absolute, dictative nature onto Christian scripture. Ahmed Deedat rose to fame in the 1980s by debating Christian apologists like Josh McDowell and Jimmy Swaggart and challenging the reliability of the Bible. Deedat was born in 1918, suffered a severe stroke in 1996, and passed away in 2005. Critics now find 120 alleged contradictions on a website targeting the Quran.

Accusations that the Bible was corrupted through wholesale alterations are historically untenable because early Christianity possessed no central authority capable of recalling thousands of widespread copies. By the fourth century, thousands of copies of biblical texts existed independently across the ancient world.

Conversely, Islamic history explicitly records that Caliph Uthman recalled all Quranic manuscripts, burned them, and issued standardized copies between approximately AD 644 and 655 during his rule over the Muslim ummah. This centralized recension generated documented resistance from Muhammad's companions.

4. Traditions of Founders and Warfare

Classical Islamic jurisprudence and the actions of Muhammad include jihad and capital punishment for apostasy, contrasting with the pacifist teachings of Jesus.

Apostasy and Jihad

Traditional schools of Sunni and Shia Islam uphold the death penalty for apostasy based directly on the exemplar and recorded actions of Muhammad. Denying this law represents a modern phenomenon rather than historical orthodoxy.

A devout Sunni Muslim friend of the author stated in a conversation that if they were in a Muslim country, he would kill the author for leaving Islam because it is the command of the Prophet. Modern Muslims attempt to adapt Islamic understanding to Western moral notions in the 21st century.

Extremist groups like ISIS draw their justification not from recent consensus, but from early historical accounts of Muhammad's battles, rules on female captives, and treatment of defeated groups like the Qurayza Jews. Peaceful Muslims must either ignore these extensive traditions, reject Muhammad's actions, or reframe them.

ISIS appeals to hadith where Muhammad encouraged men to have sex with female captives whose husbands were still alive, which led to the revelation of Quran 4.24. Over 140 Muslim scholars sent an open letter to ISIS condemning their violations of a century of consensus on slavery. Muhammad participated in or commissioned 86 battles over nine years after gaining an army.

Popular narratives depict the Crusades as unprovoked aggression, but historical analysis showed they began after the Byzantine emperor asked Pope Urban II for help against expanding Seljuq Turks. Muslims had been conquering Christian territories and enslaving populations, including Christian boys who were turned into slave warriors known as mamluks, since the 7th century.

Pope Urban II issued the First Crusade on November 27, AD 1095, in Clermont, France, urging Christians to defend the East and Byzantium. Muslims had lived in the Middle East for over 450 years before the First Crusade. Only 44 years elapsed between Muhammad's death in AD 632 and Amr's sweep through Egypt in AD 640. Two-thirds of the Christian world was captured by Muslims by the time the Byzantine emperor asked for papal help.

Jesus Versus Jihad

Unlike Muhammad, who engaged in military campaigns and taught that jihad could purge sins, the historical Jesus never carried a weapon and commanded his followers to love their enemies and put away the sword. Christians did not develop holy war concepts until the Crusades, over a thousand years after Jesus, going far beyond early theologians like Augustine.

Jesus instructed his followers to turn the other cheek and explicitly stated that all who draw the sword will die by the sword. Early Christians practiced 300 years of nonresistance following Jesus' peaceful words. War was viewed as a justifiable evil under Augustine's arguments for 600 years before holy war concepts emerged.

Critics often cite verses like Jesus bringing a sword or cleansing the temple as proof of sanctioning violence. However, biblical exegesis shows these refer to family divisions or use specific multi-purpose tools like the machaira rather than weapons of war, and parables cannot be interpreted as literal personal mandates.

During a public debate in London, former Christian debaters argued that Jesus brought a sword to earth, ignoring the immediate context where he explains it causes familial division. Jesus told his disciples that two swords were enough for a long journey, proving they were traveling accessories rather than armaments for battle.

God commanded specific military actions in the ancient Hebrew context after giving populations centuries to repent, whereas Islamic texts command fighting polytheists, Jews, and Christians based on their beliefs unless they submit or pay a ransom tax. Furthermore, these violent directives are found in chapter 9, which is traditionally considered the final major chapter revealed.

God delayed fulfilling the promise to Abraham because the sin of the Amorites had not yet reached its full measure, allowing four hundred years for repentance. The Canaanites and Amorites were given 400 years to repent before experiencing divine judgment through the Hebrews. Chapter 9 of the Quran contains the final marching orders and instructions to fight non-believers.

Constructing an objective comparative case requires distilling Christianity and Islam down to five testable historical claims regarding their core tenets.

To cut through peripheral denominational debates, the author and his colleague David established five core points: Jesus' death by crucifixion, his resurrection, his claim to be God, the prophetic authority of Muhammad, and the divine inspiration of the Quran. These points form the verifiable foundation required to test truth claims.

The author used to challenge Christianity by claiming New Testament textual corruption, but systematic study required testing historical assertions such as the crucifixion. There are 5 core points chosen to structure the investigation between Christianity and Islam. The author spent 4 years examining the claims of both religions before embracing Christianity.

5. Historical Evidence for Jesus and Muhammad

The historical evidence for Jesus' crucifixion and resurrection is remarkably robust, while traditional accounts of Muhammad's life and the Quran face significant historical challenges.

The Crucifixion and Resurrection

You can examine near-unanimous scholarly consensus across Christian, non-Christian, and even Muslim academia that Jesus died by crucifixion. During a 2002 interfaith dialogue involving Nabeel Qureshi, his father, and scholars Mike Licona and Gary Habermas, the striking unanimity of non-Muslim historians served as a major perspective check. Multiple independent sources from Christian, Jewish, and Roman authors uniformly report this execution within the first century. Paul's letter to the Corinthians contains a creed formulated within five years of Jesus' death that explicitly testifies to his crucifixion and burial.

Crucifixion was an exceptionally brutal Roman execution method carrying intense social stigma, making its proclamation counterintuitive. The Minimal Facts Approach argues that the best historical explanation for universally agreed-upon facts is his literal resurrection from the dead. This method relies on facts accepted by over 90 percent of critical scholars:

• Jesus died by crucifixion.
• His disciples genuinely believed he appeared to them risen.
• Former skeptics like Paul and James experienced conversions after believing they saw him alive.

Early creeds list over five hundred people who allegedly saw the risen Jesus simultaneously. Alternative naturalistic hypotheses fail to adequately account for these established historical facts without severe logical strain.

Assessing Islamic Claims

Islamic traditions explain Quran 4.157 either through the Theistic Swoon Theory or the Substitution Theory. Specific narratives regarding Jesus trace back historically to earlier second-century infancy gospels and Gnostic texts rather than eyewitness accounts. In the Gnostic Gospel according to Basilides, Jesus escapes crucifixion by switching faces with Simon of Cyrene.

Muslim apologists often attribute mainstream Christian divergence to an alleged corruption orchestrated by the Apostle Paul. Yet Paul was secure as a student of Gamaliel and willingly suffered beatings without gaining material wealth. Historical records show he submitted his preaching to Peter, James, and John.

While Islam highlights Muhammad's noble character, primary sources reveal severe counterevidence concerning his initial psychological reactions, warfare practices, and treatment of enemies. Early biographies record troubling events such as Muhammad's initial suicidal thoughts after seeing a spirit and ordering executions. According to early biographies, Muhammad personally oversaw the beheadings of up to nine hundred men on a single day.

Claims of miraculous scientific knowledge fail because the stated science was known in antiquity or factually false. The Quran asserts in 86.7 that semen is produced between a man's backbone and his ribs. Traditional Islamic hadith filtering methods cannot eliminate problematic historical accounts, leaving modern non-Muslim historians to question traditional narratives.

10 Key Ideas

1. A rigorous comparative examination reveals that the historical evidence strongly supports the Christian claims of Jesus' deity, crucifixion, and resurrection over Islamic theology.
2. The fundamental structural difference between Islam and Christianity is that Islam offers a law to follow to earn paradise, whereas Christianity offers a person who provides eternal life through grace.
3. Just like undiagnosed clinical depression prevents proper treatment, misdiagnosing the fundamental problem of humanity leads to ineffective spiritual remedies.
4. While Islam insists on an absolute monad through tawhid, Christianity defines God as one being in three persons.
5. Muslims view the Quran as the uncreated eternal speech of God, whereas Christians view the Bible as an inspired written record with independent textual transmission.
6. Classical Islamic jurisprudence and the actions of Muhammad include jihad and capital punishment for apostasy, contrasting with the pacifist teachings of Jesus.
7. Constructing an objective comparative case requires distilling Christianity and Islam down to five testable historical claims regarding their core tenets.
8. The historical evidence for Jesus' crucifixion and resurrection is remarkably robust, while traditional accounts of Muhammad's life and the Quran face significant historical challenges.
9. Islam misdiagnoses humanity's core problem as mere ignorance curable by law, while Christianity correctly diagnoses it as a deep-seated spiritual brokenness requiring heart transformation by God.
10. The transition from one absolute worldview to another demands a rigorous examination of historical facts, sacred texts, and theological doctrines when religious convictions clash with your closest relationships.