I respectfully disagree. The early church knew nothing of the Papacy, the veneration of Mary and the saints, Purgatory, the Immaculate Conceptions, Mary's Perpetual Virginity, and the Bodily Assumption of Mary.All of these things are "add-ons" and would not have been tolerated as sound doctrine in the early church.
Nor the trinity, the New Testament, salvation by faith alone ( that on took about 1500 years to get invented) etc...