It is easy to see that no entity can be simultaneously omnipotent and omniscient. Omniscience means complete knowledge (of past, present and future) and omnipotence implies a power to go against that knowledge.
If we just think about random numbers, this will become clear (or hopelessly confusing at least :)) Here is how: Suppose that there are true random numbers. ie., somebody can generate numbers that can't be predicted beforehand. This implies that nobody is all-knowing. On the other hand, if all supposedly random numbers are only pseudo-random, no one is all-powerful QED.
If we just think about random numbers, this will become clear (or hopelessly confusing at least :)) Here is how: Suppose that there are true random numbers. ie., somebody can generate numbers that can't be predicted beforehand. This implies that nobody is all-knowing. On the other hand, if all supposedly random numbers are only pseudo-random, no one is all-powerful QED.