“Well, lets just say that your contention that it started with Peter and Christ couldnt possibly be true. Heres a hint for you. Its called the Roman Catholic Church. AKA the church started by Romans. Incorporating many of the pagan beliefs, practices, and vestments of the Roman pagan religions.”
I notice you failed to answer the question.
When do you believe the Roman Catholic church formed?
Well, it was in 384 A.D. when Siricius (384-399) became the first Roman Bishop to call himself “Pontifex Maximus” and the first time “POPE” was a title. Constantine legalized Christianity with the Edict of Milan in A.D. 313 but one could resonably say it really started as the RCC in A.D. 325 when Constantice called the Council of Nicea in an attempt to unify all the Roman religions. The formal combining of paganism and Christianity was fully embraced at that time and has continued to this day in the RCC.