The major doctrinal divisions between Christianity and Islam

The major doctrinal divisions between Christianity and Islam center on God’s nature, Christ’s identity, salvation’s mechanism, and scriptural authority—differences so fundamental they shape entirely divergent religious worldviews.

God’s Nature and the Trinity

Christians express God’s oneness as a divine threeness, while Muslims insist upon consistent monotheism[1]. The Qur’an criticizes the doctrine of the Trinity and the divine sonship of Jesus Christ[2], viewing these concepts as violations of pure monotheism. This disagreement proves irreconcilable—both traditions cannot simultaneously be correct about God’s fundamental nature.

Christ’s Identity and Work

The person and mission of Jesus represent the deepest theological divide. Jesus was the incarnation of God to Christians; for Muslims he was a great prophet but not divine[1]. For Christians, Jesus is the incarnation of the One True God, the second member of the Triune Godhead, the Son of God, the Messiah, the sacrificial atonement for the sins of humankind, and the resurrected Savior[1]. Muslims deny the crucifixion, reject the concept that anyone can atone for another person’s sins, and view Jesus as a prophet like Muhammad but neither a priest nor a king[1].

Salvation and Human Nature

For Christians, salvation is acquired by grace through faith; Muslims believe they must earn their salvation through obedience to Allah[1]. Islam rejects the doctrine of original sin, with Muslims generally believing that human beings are born innocent but weak[3], whereas for Christians, atonement for inherited sin is essential[1].

Ultimate Goals and Authority

The supreme goal in Christianity is to love the Lord with all your heart and to love your neighbor as yourself, while the supreme goal in Islam is to bring the whole world under the dominance of Allah[4]. The Bible alone is the Word of God for most Christians, as the Qur’an is for Muslims[1].

[1] Larry Poston, “Islam: Theological Exchanges,” in Handbook of Religion: A Christian Engagement with Traditions, Teachings, and Practices, ed. Terry C. Muck, Harold A. Netland, and Gerald R. McDermott (Grand Rapids, MI: Baker Academic, 2014), 166.
[2] Sinclair B. Ferguson and J.I. Packer, in New Dictionary of Theology (Downers Grove, IL: InterVarsity Press, 2000), 343.
[3] P. G. Riddell and M. J. Nazir-Ali, “Islam and Christianity,” in New Dictionary of Theology: Historical and Systematic, ed. Martin Davie et al. (London; Downers Grove, IL: Inter-Varsity Press; InterVarsity Press, 2016), 460.
[4] Daniel Janosik, The Guide to Answering Islam: What Every Christian Needs to Know about Islam and the Rise of Radical Islam (Cambridge, OH: Christian Publishing House, 2019). [See here.]