How to Think about Peddlers of a False Gospel

What are churches to think about and do with peddlers of a false gospel? Paul makes it clear: they are anathema. This is language of the keys of the kingdom. It is the responsibility of the church to close to doors of the kingdom to such people through excommunication. "Cast out the bondwoman and her son for the son of the slave woman shall not inherit with the son of the free woman!" In this sermon, we see how Paul's declaration of "anathema" (Gal 1:8, 9) is intimately connected with the curse of the law upon anyone who does not abide by all things written in the Book of the Law and do them.