Roman Catholicism is the Perfect Illustration of Another Gospel

From Christian Research Network:

In RICK WARREN IS SAYING PROTESTANT REFORMERS LUTHER AND CALVIN WERE WRONG I point out that compromisers of Christianity like Southern Baptist "Protestant" Rick Warren have done away with the Reformation and fully accept the Roman Catholic Church as a Christian church.

However, one of the clearest ways to show that apostate Roman Catholicism is another gospel, which is no gospel at all, is to look more closely at chapter 1 of the Book of Galatians. And this is what Apprising Ministries does in this piece.