Where the traditions land

The hinge

This is at least three separate disagreements, not one. Reformed and Southern Baptist land on "no" because they define saving faith by its outcome — if someone falls away, the faith wasn't real to begin with, which makes the position unfalsifiable by design. Catholic, Lutheran, Wesleyan, Pentecostal, and Adventist land on "yes" by locating the loss at different points — a single mortal sin, ongoing unbelief, sustained rejection, a broken relationship, a final judgment — but they share the premise the Reformed position denies: that real faith can still fail. The Orthodox families reject the frame underneath both sides, treating salvation as a lifelong process rather than a status with a beginning that can be dated. LDS and Jehovah's Witnesses aren't arguing inside this frame at all — they're using different categories entirely.

None of this resolves by more argument. The Reformed/Wesleyan split depends on an unfalsifiable claim about what happened at the moment of "true" conversion. The Orthodox split depends on whether salvation is an event or a process before the question is even asked.

Sources

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

• Catholic — Catechism of the Catholic Church
• Eastern Orthodox — no single catechism binds all autocephalous churches; no standing link by design
• 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?