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.
The only reason you even know what books belong in your "inspired by God and closed" book is because the "RCC" decreed it, 1600 years ago.
Go ahead: prove to me from the Bible, and the inspired text of the Bible alone, that 1 Peter or Philemon or 3 John belongs in the Bible. You can't, which is why Luther called James an "epistle of straw" and wanted to remove it.
For Catholicism their “traditions” trump scripture anyway. They can make up what they want and for the followers it becomes scripture because the RCC has decreed they believe it.