The following shouldn't be taken 100% seriously, but I think it would be interesting to see how it played out if somebody actually did this...
Instead of fighting against it, I say the kid should wholeheartedly embrace it. Go balls to the wall with the Bible.
Mom wants to go shopping on Sunday? "Sorry mom, God says that's the day of rest. Why are you asking me to violate the sabbath?"
"I found some toys in one of your drawers mom. Masterbation is a sin, so, for your own good, I had to give them away. Just to be sure you soul was safe, I also took 10% of the money in your wallet and tithed it to the church."
"I think dad should consider a second wife; most of the great men in the Old Testament had multiple wives."
"Mom, I think I might have the drop out of school. They're trying to brainwash me into believing the world wasn't created in 7 days."
(For the record, yes, I would consider myself Christian.)