I'm with BMAD on this one - I believe that there is on omnipotent "creator", some sort of incomprehensible being that created the universe. Simply put, there is really no other way.
But I do believe that's where things stop. This "God", for lack of a better world, was the stimuli that began the world. However, I don't think that "It" shaped creatures and all that. Evolution (really, just natural selection over millenia) took its course. This creator probably does not guide us in particular (humans are, at the basic level, animals. And no other animals get divine help). Maybe there's an afterlife, maybe there isn't. But this creator is out there somewhere, doing...God stuff, I guess. Probably off messing around with a world where elephants have wings and civilization and stuff.