*sigh* This tired, sad old argument again...
Honestly, I think the whole omnipotent-God thing is a cop-out. If you believe in an all-powerful god, you essentially never have to think, because everything happens because he says so, anything CAN happen, there need not be any underlying cause and effect, people are too stupid to understand the universe, go watch TV- there's nothing you can possibly do for God that he can't already do himself with no effort at all. It's an irrefutable claim, but then again so is the theory that Hitler was an artificial cyborg built by aliens from the planet Zontar in order to take over the Earth and soften up humanity for the invasion.
Also, it takes a hell of a lot of the fun out of life. It's something fantastic, to go out in the world, see all the infinitely complex structures around you, working together perfectly with their world, and to realize that this all came about on its own. The idea that the world is the sandbox of a celestial toddler is a depressing concept indeed. There's no "miracle" to a universe with a God who can do anything, whenever he likes, however he likes. Things just happen, under such a theory, and it's just as concievable that people could lift off the ground and fly about as that they'll continue walking down the street, strictly terrestrial, if you believe in an almighty God. I find it MUCH more interesting to rule a Lord out of the picture, and see the way things work without some big man in the sky calling the shots- and they do, they absolutely do.
'Course, if there was any concrete evidence OF a Supreme Being, I don't think I'd worship him anyway. What kind of sadistic, vile being could be infinitely powerful, create an entire universe, and fill it with such a high degree of misery? If the Bible's to be believed, in fact, at times he personally intervenes to create more of it. And He wants to be PRAISED??? The sick bastard, I'd sooner go to hell than toady up to THAT.