Are you sure the Bible says nothing of them? The church at Ephesus, Smyrna, Pergamum, Sardis, Philadelphia, and Laodicea. There were other churches that predated Constantine’s church. Galatia, Corinth, Macedonia, Rome, Colosae, Jerusalem, Damascus, etc. The churches that existed under the intense persecution of the Pope were after the closed canon. Ah ha! Are you talking about the Apocrypha? I don’t doubt there’s nothing in those books.
It’s hard to find but I’ve given you some already and you rejected it. The truth hurts and religion is a good antidote.
For the majority of the Christian era, the overwhelming majority of Christians were either Roman or Byzantine Catholic. That is simply a matter of history, despite how it might rub your anti-Catholicism the wrong way.
The only Christian populations that I can think of that existed for long enough in high enough numbers to even creep into that Catholic majority are the Armenians and the Copts. And while they existed for long enough, they never existed in sufficient numbers to challenge the Catholic majority.
For the majority of the Christian era, the majority of Christians were either Roman or Byzantine Catholics.
Still holding out hope for Prester John, or do you not even know who he was supposed to be?
Why do you feel that it is necessary to give naturalistic explanations for the wondrous events described in the Bible? I’m curious why you search for naturalistic explanations for these events rather than accept them as signs from God?