The Canon of accepted Truths was NOT decided upon by Roman Catholicism, much as that denomination would love to claim credit. The Canon of accepted Scripture formed the early church/believers — not the other way around. The Canonical teachings were already in place and accepted by the early believers.
I understand you believe that premise by faith; I don't know what you use for historical evidence. The seven books from the Catholic Bible commonly called the Apochrypha aside, there is some historical evidence of debate as to which books from the NT era should be included. Disputed Books of the New Testament
We do know this, All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness: