I suppose this is a bit old, but I was reminded of it by 'The Curious Incident of the Dog in the Night-Time' by Mark Haddon. It's not about church or theology . . .
This is the puzzle which came up on a programme hosted by Marilyn vos Savant (purported to have the highest IQ in the world!)
In a game show a contestant is shown three doors. He is told that behind two of the doors there is a goat. Behind the other door there is a car. He must guess the correct door in order to take home the car. After the contestant makes a guess, the host opens one of the other doors to reveal a goat. The contestant must now choose whether to stick with his original choice or to choose the other unopened door.
What is the sensible thing to do?
I'll put the answer in a comment if I get any other comments to this!