Hmm... this is how I see it.
God is the guy that Christians and Jews and Muslims believe in. God is the philosophy of Buddhism. God is karma. God is the one who created the laws of every science there is. God is all of those things.
I think that God is much bigger than most people think. He's not just one being. He is everything.
But that's just my opinion... Feel free to disagree, I surely haven't figured it all out. :D