The Background: Mistaking the gospel risks your soul’s salvation.
If there were “many paths to God,” it would be foolish to be too concerned about an error in someone’s theology. And why do missions at all? What would count then would be sincerity, or so the story goes. But Paul has been emphasizing, throughout the book, the uniqueness of the gospel and the “weakness” in the Cross. The sacrifice of Jesus is the only way to be made right with God, and so to follow “another Jesus” or to believe “another gospel” is to despise grace and turn instead to a man-made, self-righteous religion. Rejecting Jesus is idolatry. Gal. 1:6-10; 1 Jn. 5:10-12