Depends how good you are at playing the part, without actually doing any of the bad stuff. Churches vary, but often, it's one of those places where the tribal symbols are more important than actual substance, so taking advantage is very possible.

See: Whatever super-rich televangelist. If you're doing something similar, because you're poor and can't afford childcare, there's an argument that's not even bad, then.

Edit: Although, if OP means Sunday school or youth group specifically, the kids are going to be exposed to some shit, which you'll have to manage. An adult telling you you're going to burn alive, and that's good, isn't really fun for an 8-year-old.