Exactly. It's not enough to believe in any invisible sky wizard, you must believe in a particular one. If you believe in the one ( Jehovah's Witnesses ) that doesn't like blood transfusions, you're out of luck.
My church is that of the Flying Spaghetti Monster. He doesn't get involved in heathcare, it takes some "all-loving" misogynist prick to do that. Although, FSM does have a thing about ninjas. Where's the anti ninja clause?