Just tossing this idea a few friends and I more or less agree upon (agnostic, atheist, and christian) out here: If you follow the Christian Bible exactly (which is the religion we seem to be talking about here) No one should eat pork or masturbate or they're doomed to hell for all eternity. If you follow science exactly the only reason for a human to do anything (The meaning of life as you might say) is to continue the species, essentially meaning you should spend your days farming, having sex, and staying warm. I find this interesting.
As for the question asked in the initial post, I don't believe you should because you don't want to. You think of God as a wizard who just magicked everything into being, you have no faith nor wish to have any. So don't. I believe in the Bible in a highly metaphorical sense than can coexist with science (what's 7 days to an infinitely powerful being, and before the earth and sun were there to make days?) I believe in God in part because when you hit the base of things scientists just have things they must just accept are true. Prove everything you are experiencing isn't just one big dream. Pascal's wager or gamble as someone earlier mentioned is another good reason I believe. I hope this helps, and please take out the stricken out "wizard" before god, that's just baiting angry response.