In the following 9 minute video by Polite Leader, he enumerates several similarities between the Roman Catholic Church and Reformed Protestantism; he identifies several totally unbiblical points and he emphasizes the huge error that renders their gospel false.
If you are not clear on basic differences between the RCC and Protestantism, then the video is very worthwhile. His videos are concise and very understandable; great teaching videos.
See Polite Leader on YouTube for concise teaching videos about many false teachers and anti Christian media….