I have recently been reading in Richard Dawkins' book, the idea that God being both omnipotent and omniscient is a contradiction. I think it is something along the lines of: if God is omniscient then He already knows how He is going to deploy His powers, which means He is effectively bound to act in a certain way -- meaning He is not omnipotent. But I'm not sure I've totaly got my heads around the concept. Can anyone add anything more?