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.
I don’t believe infant baptism is salvific. I had all my children baptized. I was baptized as an infant, but when I received Christ as Saviour, I was baptized by immersion because His Word says to believe and be baptized. I think it’s important to be baptized after conversion, which born again folk believe.
I don’t consider myself a real protestant. I am a Christian. My church is non-denominational and Spirit-filled. We believe what the Bible says. Folks make it seem so hard to understand the Gospel. It isn’t. Some parts of it are mysteries for sure, but the simple Gospel of Jesus Christ is just that—simple. Why would He make it difficult to know Him? Or to follow Him?