I know that the Catholic church added books
You know wrong. The seven so called Deuterocanonical books were removed by Luther. They were a part of the Christian canon since the Carthage councils in early 5c, which is when the entire Canon of Scripture was defined for the first time.
The promise of any church is not true, nor can it be, for any doctrine not explicitly found in the scriptures is subject to the corruptibility of mere men
You argument on this score is not with me but with the scripture, that I cited. The promise is that the Church founded on St. Peter can legislate, that Christ will uphold the legislation, and that the Church thus founded will not fail. The promise is not addressing any other hypothetical churches.
If you have not come across the anti-false doctrine (that is, not taught by Jesus and the Apostles) teaching of Paul to the Churches, and mentioned by Jesus in the Gospels, you have not read the new testament in it's entirety.
I have come across many such warnings. They were warnings against heretics such as Arius, Luther or Calvin. What I asked you to show me is any scriptural proof of the protestant superstition of sola scriptura, and more specifically, where in the Bible does it say that the Church may not teach new doctrine not expressly found in the scripture. I showed you scripture that says the opposite. You failed to do likewise for your claim.
Praying to human beings as in a prayer of faith, that due to God and the Christ, is wrong, and false doctrine, and dangerous.
I don't know what you mean by "as in a prayer of faith". Any Catholic can explain, and has explained to you the nature of intercessory prayer. You opinion of what you think these prayers mean is just your opinion. Thanks for sharing.
Such [2 Timothy 4] as the Catholic doctrine of praying to dead people
Your quote does not say anything about any form of prayer.
what you are trying to say by quoting Romans 10:15
That teaching authority is null without apostolic succession.
the kingdom of God is within you.
Very true. This is also known as Communion of saints.