[Alex Murphy]

Have you noticed that for the most the Protestants here are avoiding the question of the article: When did the Great Apostasy occur?

That's because the question itself, and proofs offered, are non sequiturs. Our armchair apologist offers Mormons and Jehovahs' Witnesses as his lead examples, but neither are protestant groups. Our armchair apologist has yet to prove that his assertion that (most/all) Protestants believe a Great Apostasy occurred.

[Petrosius]

See the article "Great Apostasy" at Wikipedia. But if the Great Apostasy did not occur then the Church which declared the canon of Sacred Scripture can be trusted in handing down the true gospel throughout the ages until today. This historical and continuing body of teaching can only be found in the Catholic Church.