a.k.a. Pascal’s Wager: http://en.wikipedia.org/wiki/Pascal%27s_Wager . It’s rather broken as a theological argument, if only for the fact that who’s to say you’re choosing the right religion if you do decide to go down the spirituality route?
I'm not suggesting that logic would lead you to adopt any certain religion. I'm just saying the question itself isn't meaningless, because it's answer is actually pretty important (not that we can know for sure what the answer is).
