Pascal's wager.
Although I'm sure you've heard this rejection before, I'll state it anyways: Even if you chose to follow Pascal's wager, which religion? There is no way to know which is right and if you choose the wrong one, you're damned anyways (unless a universalist god is the "real" one).
Nevertheless, the wager itself deals with a subject that is totally irrelavent to the human condition as the proverbial teacup orbiting Mars. You expect me to base my whole life on a notion that can never be proven while alive and I have to wait until death to see whether it is true or not? Of course, if I'm right and follow Pascal's wager anyways, I will have wasted my entire and only life. Even if I'm wrong, doesn't necessarily mean I'm going to go to hell, since, as stated before, any religion that has beliefs in the afterlife could be wrong and all possibilities do not lead to hell.
The most rational thing to do, therefore, is to wait and see if this cosmic comedian decides to show himself to us. If a god did create us, he must've "endowed us with reason." Reason dictates that we shouldn't believe, much less base our lives around something, without any proof (doesn't seem very smart to believe that you have invisible beings around you all the time, without any proof at all, does it?); since all our proofs about the universe around us come from sensation (ie., sight, etc.) and invention (ideas, like math, etc.), to use Lockean terms, it stands that god's existence can never be known by humans.