The Great Apostasy

Iglesia ni Cristo, Mormons, Seventh Day Adventist and various other non-Catholic groups claim that in the days immediately after Jesus ’Ascension, the Catholic Church apostatized en masse. One problem with this theory is that, if it is true, then Jesus’ promise not to let the netherworld prevail against his Church (Mat. 16:15-19) was false – which we know cannot be the case.