Where the traditions land

Population figures are each tradition's own most recent published count. Eligibility is set against the World Christian Database, the standard reference for global denominational data.

Why the disagreement

Historic Christian teaching on this question is about as close to universal as this format gets. All ten Nicene-tradition seats affirm, in nearly identical language across confessional families five centuries apart, that Jesus is "true God and true man," "of one substance with the Father" — the same formula the Council of Nicaea adopted in 325 specifically to rule out the idea that Christ is a lesser, created form of divinity.

The two traditions outside that consensus depart from it in different directions, and both are recent relative to it. Latter-day Saints (founded 1830) affirm Jesus as fully divine and a member of the Godhead, but as a separate being from the Father rather than one identical divine substance — LDS theology doesn't use the metaphysical category the Nicene claim depends on. Jehovah's Witnesses (founded 1870s) go further, teaching Jesus is "a god" in a real but subordinate sense, the first being God directly created and the one through whom everything else was made, and explicitly deny he is God Almighty.

Solving the disagreement

This fork sits one level deeper than most, because it isn't really a dispute over what any shared text says — it's a dispute over which texts get to count as evidence at all. The Nicene position and the LDS position could both examine the New Testament exhaustively and never resolve their disagreement, because LDS theology holds that the Book of Mormon and continuing revelation carry the same or greater authority, and no verse in a text one side doesn't accept as final can adjudicate the dispute. Jehovah's Witnesses' position depends partly on a specific translation choice at John 1:1 ("a god" rather than "God") that most scholars outside their tradition reject — that piece, unusually for this format, is a real linguistic question specialists could in principle adjudicate. But the larger disagreement over whether revelation closed with the apostolic canon is not a linguistic question; it's the premise a person has to already hold before any specific verse can settle anything for them.

Sources

Same standing source per tradition on every post, not hunted per question.

• Catholic — Catechism of the Catholic Church
• Eastern Orthodox — Nicene-Constantinopolitan Creed (binding across all jurisdictions); The Longer Catechism of St. Philaret of Moscow (widely used, not binding on every jurisdiction)
• Oriental Orthodox — Catechism of the Coptic Orthodox Church, Fr. Tadros Y. Malaty (Amazon — no full free text found)
• Anglican — Thirty-Nine Articles of Religion
• Lutheran — Book of Concord
• Reformed/Presbyterian — Westminster Confession of Faith
• Methodist/Wesleyan — Articles of Religion
• Southern Baptist Convention — Baptist Faith & Message 2000
• Pentecostal (Trinitarian) — Assemblies of God Statement of Fundamental Truths
• Seventh-day Adventist — 28 Fundamental Beliefs
• LDS — Book of Mormon and Doctrine and Covenants
• Jehovah's Witnesses — What Does the Bible Really Teach?