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

In 431, the Council of Ephesus condemned a bishop named Nestorius for teaching that Mary should be called "Christ-bearer" rather than "God-bearer," on the grounds that the two natures joined in Jesus, divine and human, are too closely united to say Mary bore only the human part. The council's point was about Christ, not Mary: if Jesus is one person who is fully God and fully man, the woman who gave birth to him gave birth to that one person, full stop.

Catholic, Eastern Orthodox, Oriental Orthodox, and Lutheran teaching affirm that reasoning and treat the title itself as settled doctrine. The Formula of Concord states it almost in the council's own words: Mary "conceived and bore not a mere man and no more, but the true Son of God; therefore she also is rightly called and truly is the mother of God." Luther defended the title repeatedly in his own writing as a statement about Christ's identity, not an honor paid to Mary.

Anglican, Methodist, Southern Baptist, Pentecostal, and Adventist teaching affirm the same underlying claim — that the child born of Mary was, from conception, the eternal Son of God, fully divine and fully human at once — without making the specific title a matter of official doctrine. Anglican Article II describes Christ taking "Man's nature in the womb of the blessed Virgin" so that "two whole and perfect Natures... were joined together in one Person" — the same substance as the Ephesus ruling, without the word Theotokos itself. Southern Baptist, Pentecostal, and Adventist statements of faith affirm Christ's eternal deity and virgin birth in similar terms, but none makes the title itself a question to settle one way or the other.

Reformed teaching is a sharper case: Calvin agreed with the doctrine behind the title but explicitly disapproved of the title itself, writing that calling Mary "Mother of God" in preaching was neither right nor becoming — not a denial of Christ's full deity, but a judgment that the phrase invited exactly the kind of devotion to Mary the Reformed tradition wanted no part of.

LDS teaching holds Mary as the literal mother of Jesus Christ, the Son of God, but doesn't teach or use the title "Mother of God." Part of the reason is structural: LDS theology holds the Father, Son, and Holy Ghost are three distinct divine beings rather than one being in three persons, so the logic behind the Ephesus title — that Mary bore one person who is, in substance, the same God as the Father — doesn't map onto LDS theology the same way.

Jehovah's Witnesses reject the title outright and tie the rejection directly to their rejection of the Trinity: their teaching holds Jesus is "the Son of God," not God himself, and states plainly that the terms "Mother of God" and Theotokos appear nowhere in the Bible.

Solving the disagreement

Between the traditions that use the title officially and the ones that affirm the same Christology without it, there isn't really a doctrinal dispute to solve. Catholic, Orthodox, and Lutheran teaching on one side and Anglican, Methodist, Baptist, Pentecostal, and Adventist teaching on the other agree that Christ was fully God from conception. What's unsettled is a narrower question of doctrinal housekeeping: whether a title has to be formally adopted for the underlying belief to count as taught. That's the kind of gap a shared statement could close without either side changing what it actually believes.

Reformed teaching sits closer to resolvable than most forks in this format, because Calvin's objection was never to the Christology — it was a prediction about how a title gets used once it's in circulation. Settling it wouldn't take new theological argument; it would take confidence that using the phrase doesn't function, in practice, as a door into the kind of Marian devotion Reformed teaching rejects. That's a judgment about religious practice, not a truth claim about Christ, which makes it a different kind of fork than the others here.

LDS and Jehovah's Witness teaching both come back to the same premise that keeps recurring in this format: what it means for something to be "one God." LDS theology holds three distinct divine beings; Jehovah's Witness theology holds one supreme being with Christ as a distinct, lesser, created one; historic Nicene teaching holds one being in three persons. The title "Mother of God" only carries the meaning the Council of Ephesus intended inside that third framework — so resolving it isn't really about Mary at all, it's about which account of God's own nature is correct, and none of these traditions currently agree on how that deeper question would even get adjudicated.

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?