Interesting, I'm am "tacking on" to the Bible?
Your quote Jesus and do not even realize that the Catholic Church has a long history of contradicting the very quote you use.
No man comes to the father but through Jesus. So we agree that salvation through works is a lie and an addition to the Bible. Salvation through works denies the work of Jesus and grace of God.
And we agree praying to Mary is a lie, you only come to the father through Jesus.
Who is adding to the Bible? We are talking about salvation here, its a topic worth getting right.
As to what "historians" or "catholics" think is irrelevant, the Bible is the standard.
What's with the reference to Philemon? As I recall that book involves a runaway slave accepting the word of God and then returning to his Master. Paul offered to pay any debts and accept him as a brother in Christ. I never suggested that anything someone had done would prevent them from being a Christian as much as any Christian. The key is accepting the word of God, not calling yourself a Christian. Big difference.