I'm a little confused. You're the parent and he's the kid. It sounds like he sort of "wears the pants" and you don't. My daughter doesn't like "Sunday School" but she doesn't have an option in the matter. It sounds like you and your son have the problem not the Sunday School.
This is what I've always done so far, him not having an option, and that has led to this current situation. He has gone from complaints to this current behaviour that only happens in church. I feel it has escalated because I have made him go despite his protests.
He believes what is taught, speaks about the same beliefs at home. The class has not been appropriate to his development since having a great teacher when he was 4. As far as I know, the situation will be the same if we attend another chapel.
