@BadOptniks @James_Dixon @patris @JohnYoungE @Escoffier @Sulla_Felix @somemightsay Traditionally, the heresy specifically mentioned in Galatians is understood to be judaizing / legalism - which is the belief that the rites of the Old Covenant are necessary for Salvation.
This doesn’t relate to Church Councils - one of which is itself recorded in Acts, the First Council of Jerusalem, presided by St. James the brother of Our Lord. I’m sure you’d likely argue that’s different specifically because it’s Biblical. We’ve never had reason to make that distinction - since we’re the ones that did it in the first place.