@OT: consider convertables. Or motorcycles. Windshields protect the rider from insects and other airborne objects. (not sure if you were serious or not . . .)
@Jmdt: Brilliant men make mistakes, just like anyone else. There has never been a scientist who never made a flawed prediction.
As to the main subject of this thread, this will probably be one of the few times I agree with Daxx in the religion section.
Pascal's wager is not a good reason to hold a belief. Moreover I would argue that it is actually impossible to hold a belief (any belief) because of Pascal's wager or a similar argument.
Suppose a man were to approach you and show you a suitcase full of money. He tells you he is going to give you all of that money, but only if you can convince yourself that the moon is made out of cheddar cheese. He has a super-advanced lie detector which he wires to your head, so he will know if you're lying and only saying that you think the moon is made of delicious, delicious cheese.
Can you win the money? Of course not.
A human being cannot simply start believing something is true because holding that belief will benefit him/her. Faith should not be treated as a wager.
Pascal's wager does highlight some interesting things, but it is not a reason for people to convert, and was never intended to be used as one.