They also ask if you're married or single, without informing you that your answer affects your tax bill. What's up with that, eh?

Difference is that most of us expect that question to have tax implications, based on our home countries - whereas most of us don't expect the church question to have any (again based on our home countries.) So yeah, you make a careless assumption and it bites you. Bit me too. I don't think we can blame this one on the sneaky Swiss though.