Do you honestly believe the Christians of the first 4 centuries had no record of the revelation of God? There were Paul's letters circulating, Peter's letters, the Four Gospels of Matthew, Mark, Luke, and John...and on and on.
Later on, consensus was arrived at...but the writings were around for all of that time. The Roman Catholic Church did not originate the "Book" 400 years after Christ.
Did you read his first post?