Throughout the written history of humanity, people have been trying to figure out why we exist on this planet, and it usually brings up the existence of a higher power.
I think that the reason there is life on this planet is because we won a universal lottery.. we just happened to be close enough to a sun and have a terrestrial planet with the necessary chemicals capable to produce an atmosphere that supports humanity. I don't think there is a God who did this, I think we were just lucky. It seems that most theists argue, 'well, if there is no god, how did the universe form.. something can't come from nothing' ... an easy argument for a theist because we do not know how the universe began, and therefore difficult to argue against. So, if someone wants to tell me that 14 billion years ago or so there was some higher power who decided to create a few more quarks than antiquarks when creating a primordial soup of subatomic particles, i'll just shake your hand and say i'm fine with that. However, that's not what the whole point of God is all about. We're supposed to be special... we're supposed to be watched over and loved by this described "God".. this "where does the universe come from" argument doesn't address that at all. We have life, who knows how many other planets in the universe have life.. we're lucky, yes. Special? No...
There's not one other species on this planet that believes in a higher being. Aside from that, there's all different religions believing different things all over the world. That would indicate that the concept of religion is more social than factual - if God wanted to make himself known, he would do it so every human believes in him, and not just Christians or Muslims, or whatever... I find that interesting. Isnt it ironic.. the only reason we believe in God is because humans are sophisticated enough believe in, what i consider to be, "supernatural foolishness."
But this is just one man's opinion.