you mention something about 300 years...in the first 300 years of Christianity, the Catholic Church, (the only Christian church at the time) had 29 Popes...Peter, Linus, Cletus, Clement, Evaristus, Alexander, Sixtus, Thesphorus, Hyginus,Pius I, Anicletus, Sofer, Eleutherius, VictorI, Zephyrinus, Callistus, Urban I, Pontain, Anterus, Fabian, Cornelius, Lucius I, Stephen I, Sixtus II, Dionysius, Felix I, Eutychian, Caius, and Marcellinus 296-304....I have no idea how you missed all these guys, they are all saints.
Retroactive popes, retroactive "Catholics," there were only Christians until Catholics became a Christian denomination.
It's interesting that there was no need for denominations, all believers were Christians, until the Catholic denomination came along and "claimed" all Christians were Catholic.
Then of course other denominations sprung up to counter the denomination run by men, Catholicism.
Christians naturally balked at that idea, as they followed God, not men. (Shades of the Pharisees!)
Remember your post where you stated (quoting my post)Christians allow ONLY the Holy Spirit to interpret Scripture, Catholics use men.
There were no popes for hundreds of years, MEN saying there were by rewriting history is close to blaspheme.
It appears you are not ready for the meat of the Word of God, my mistake trying to teach you Biblical Truths apparently beyond your comprehension as you repeat the same false beliefs over and over.
Except I am so glad your realize that Christians allow ONLY the Holy Spirit to interpret Scripture, Catholics use men. One step at a time out of darkness into light!