God didn't drop the Bible on earth with a parachute. It came through the church, and in the timeframe we're talking about (ca AD 400), there was only one church.
really. Explain the 7 churches in revelation? The Roman Church has never been the only visible Church despite its best efforts to sell that lie
You’re right, there is one church with Jesus as the Rock upon which it is founded on. All the rest is hogwash.