Who says a god has to be omnipotent?
Omnipotence has its own problems - If God can do anything, can He create a rock too heavy for Him to move?
Contemplating these absolutes like omnipotence or omniscience is just as mind-boggling as trying to contemplate infinite time or infinite space. The human mind was not designed for it. I would rather go back to messing with my model trains.
Mike.