Do Christians Believe in Strict Monotheism? A Three-Faith Comparison

Judaism is perhaps the most uncompromising of the three traditions when it comes to strict, unitary monotheism. The Shema (Deuteronomy 6:4)—"Hear, O Israel: the LORD our God, the LORD is one"—is recited twice daily and functions as the theological cornerstone of Jewish identity. The Hebrew word echad (one) is understood by mainstream rabbinic tradition as absolute numerical oneness, not a compound unity.

Medieval philosopher Maimonides (1135–1204) codified this in his Thirteen Principles of Faith, explicitly stating that God is utterly indivisible and that any attribution of plurality to God constitutes a fundamental error. This position directly rejects the Christian Trinitarian formula. The Talmud (tractate Sanhedrin) and later kabbalistic works explore divine attributes, but even Kabbalah's sefirot are understood as manifestations of one indivisible Ein Sof, not separate persons.

From a Jewish perspective, Christianity's doctrine of the Trinity—and particularly the veneration of Jesus as divine—crosses into what is called shituf (association), a category that, while debated among authorities, is widely considered incompatible with pure monotheism as Judaism defines it. Scholar David Novak and others in the 20th-century Jewish-Christian dialogue have acknowledged the depth of this disagreement while still seeking common ground.

Christianity's answer to this question is genuinely complex, and Christians themselves have debated it fiercely. The short answer is: yes and no, depending on how you define "strict."

Christians firmly confess one God—not two or three gods. The Nicene Creed (325 CE) opens with "I believe in one God." In that sense, Christianity is monotheistic. However, Christian orthodoxy also holds that the one God subsists in three co-equal, co-eternal persons: Father, Son, and Holy Spirit. This is the doctrine of the Trinity, formalized through councils at Nicaea (325 CE) and Constantinople (381 CE).

This is precisely where the "strict" qualifier becomes contested. Unitarians, Jehovah's Witnesses, and early groups like the Ebionites rejected Trinitarian theology as a corruption of original Jewish monotheism. Mainstream Trinitarian theologians—from Athanasius of Alexandria to Karl Barth in the 20th century—insist the Trinity does not compromise monotheism because the three persons share one divine essence (ousia).

Paul's letters reflect a high Christology without fully resolving the philosophical tension. For example, Philippians 3:3 calls believers to "worship God in the spirit, and rejoice in Christ Jesus" Philippians 3:3—holding Christ and God in close theological proximity. The early church's worship of Jesus alongside the Father was the experiential reality that drove Trinitarian formulation.

So: Christians believe in monotheism, but not in the strict unitary monotheism of Judaism or Islam. Most Christian theologians would say this is a richer monotheism, not a diluted one—though critics in both sister faiths strongly disagree.

Islam holds the most explicitly articulated doctrine of strict monotheism among the three faiths, expressed through the concept of Tawhid—the absolute, indivisible oneness of Allah. The Quran's Surah Al-Ikhlas (112) is considered a summary of Islamic theology: "Say: He is Allah, the One; Allah, the Eternal Refuge; He neither begets nor is born, nor is there to Him any equivalent."

The Quran directly addresses the question of Christian belief and is unambiguous in its critique of Trinitarian theology. Surah An-Nisa (4:171) warns Christians not to say "three"—"desist, it is better for you." From an Islamic standpoint, attributing divinity to Jesus constitutes shirk (associating partners with God), which is considered the gravest theological error.

Significantly, the Quran distinguishes Abraham's pure monotheism from later Jewish and Christian developments. Quran 2:135 states: "Rather, [we follow] the religion of Abraham, inclining toward truth, and he was not of the polytheists." Quran 2:135 This framing positions Islam as the restoration of original, uncorrupted monotheism. Similarly, Quran 98:1 groups together "those who disbelieved among the People of the Scripture and the polytheists" Quran 98:1, a verse classical commentators like Ibn Kathir (1301–1373) interpreted as a warning that even scriptural communities can fall into associationism.

Muslim theologians like Al-Ghazali (1058–1111) and Ibn Taymiyya (1263–1328) wrote extensively arguing that the Christian Trinity, however sophisticated its philosophical defense, ultimately violates Tawhid. Contemporary Muslim-Christian dialogue scholars such as Seyyed Hossein Nasr acknowledge the sincerity of Christian belief while maintaining this fundamental theological incompatibility.

Not applicable. Concerns Christian self-understanding of monotheism; no direct Jewish-scripture counterpart provided in the retrieved material to ground analysis.

Christians present themselves as worshipers of the one God, and early Christian texts emphasize unified worship and communal oneness in belief and practice Philippians 3:31 Corinthians 1:101 Corinthians 12:25. Historically, mainstream Christian theologians (from at least the 2nd–4th centuries) have argued that this unity in worship reflects monotheism, even as Christians rejoice in Christ Jesus as central to faith and worship Philippians 3:3. Paul’s exhortations against schism are often invoked by Christian teachers to stress one faith and one communal body oriented to God, which Christians read as consistent with affirming one God 1 Corinthians 1:101 Corinthians 12:25.

Scholars across centuries (e.g., Irenaeus, Athanasius; moderns like Larry Hurtado) have debated how to articulate this in relation to worship of Christ, but Christians themselves typically answer “yes” to being monotheists, while acknowledging Jews and Muslims may contest the label “strict.” Given the retrieved texts, the concrete evidences shown here are the worship of God and the call to unified, non-schismatic faith community Philippians 3:31 Corinthians 1:101 Corinthians 12:25.

Islam positions itself as the religion of Abraham, explicitly rejecting polytheism as a doctrinal boundary, and often evaluates other communities by that standard Quran 2:135. The Qur’an distinguishes the People of the Scripture from polytheists, a framing that shapes many Muslim discussions of whether Christian belief counts as strictly monotheistic Quran 98:1. From this vantage, Muslim scholars have historically pressed Christians on whether their beliefs meet the Abrahamic criterion of not being among the polytheists, even while recognizing Christians as People of the Scripture Quran 2:135Quran 98:1.