I notice that you haven’t gotten an answer to that. I’m thinking they don’t want to admit that they take what the RCC says as their scripture.
Wow, I guess that's it. When the RCC says that protestants follow a book, the same is true for them. The difference is that our book was inspired by God and closed, while their book continues to be written.
Our books beyond the Bible must agree with the Bible. If they disagree, the Bible wins.
The RCC assumes that their books beyond the Bible automatically agree with the Bible. If they disagree, then it is the person who notices the disagreement who is in error. Anyone who notices a disagreement has either misinterpreted the Bible or the RCC teachings. Besides, anyone outside of the RCC hierarchy isn't eligible to judge.