I always got an "F" if I didn't show my work...
Elsie you never show your work : )
Here is a simple, easy to understand example. If God is Omnipotent then it can do anything right? So it should be trivial to build a mass that can't be moved right? But God is omnipotent and can do anything so there is no mass that it can't move. Therefor he can't build a mass that he can't move. But God can do anything, therefor it can build a mass that it can't move. Ad infinitum.
God can do one or the other but not both. When people start throwing around words like omniscient and omnipotent, those are easily falsified concepts.