Gee, we believe what the Bible says about Jesus, salvation, heaven, how to live by His scriptural principles, etc., etc. Isn’t that enough? We don’t need the extra-biblical stuff like Mariology, infant baptism, the Eucharist as salvific. We have Jesus Christ. He goes all the way back to the beginning. Isn’t that good enough for you?
No, you believe an INTERPRETATION of what the Bible says.
Your desire to give this interpretation more weight than what the Church has taught for two thousand years is meaningless.
If you were to study some history you would see how marginal Protestantism really is.
When the Eastern Church left during the Great Schism, it was based on a few theological questions. However, it was primarily a geographic change.
When the Protestant Reformation came, MOST people rejected it. It caught on in parts of what is today Germany and Scandinavian countries. It never had any strength in Italy, France, Austria, Poland, Spain or Portugal. It was FORCED on England, but that was more political and the Anglicans ignored virtually everything Calvin said.
And I will again add that even among Protestants you will not find agreement on what you claim to be "extra-biblical;" in fact, your disbelief in infant baptism puts you at odd with nearly all mainstream Protestants.