If it weren’t for the testimonies of the Church Fathers against the Gnostic heretics and others you wouldn’t know the New Testament was God-breathed, so be thankful.
I think God can protect Himself just fine. He did OK with the Old Testament. And amigo, the Church Fathers were all over the board, and the ‘Fathers’ acknowledged scripture - they did not determine it.
If God is able to provide His own Son as the Perfect Sacrifice for the sins of all mankind, I suspect He might be able to have predestined a method to communicate with believers who seek His fellowship, no matter what other humans do or don't perform.
He really doesn't have to rely on other people in the Church in order for His will to be fulfilled, although it does glorify the Son when all the members of His body work to glorify Him.