Actually, what's been working like gangbusters for Scientology's lawyers isn't the religion card at all, since they aren't recognized as one. They've left the persecuted religion bullshit to the PR people and very smartly gone for the intellectual property tactic. Nobody's allowed to publish tell-all books about the "church" because the "church" owns the terminology and ideas.
None of which would apply to this, of course. I think Fox could really clean up if they sued over this. They own Bart, and Scientology used him for promotional purposes. QED.
Overlord's a lawyer. Get him in here.