Sigh. Roman Catholicism IS NOT CHRISTIAN.
The Catholics abandoned God's laws and teachings in exchange for their own.
Jews did the same thing.
The Catholics have their own version of the Bible. They added to and/or took things out of it.
The Christian Bible clearly says NOT to do that:
"You shall not add to the word which I am commanding you, nor take away from it, so that you may keep the commandments of the Lord your God which I am commanding you (Deuteronomy 4:2, Deuteronomy 12:32, Revelation 22:18)."
Also, Catholics do a lot of practices and have a lot of beliefs that contradict what's in the Christian Bible.