The logical conclusion of this line of reasoning is that there was no Church until the 16th century... and that just makes a mockery of the promises of Christ and the reality of the first 1500 years of Christendom.
I do admire the chutzpah of the followers of Calvin.
how do you appeal to Jerome, Athanasius, Cyril and Gregory on the so called Apocrypha, yet condemn as heretics anyone who believes as they do in baptismal regeneration, the Real Presence in the Eucharist, apostolic succession, etc etc.
all these Church Fathers would have rejected Calvin as outside the Faith, but when you are drowning, you must grab onto any thin reed you can I guess.