Evilbible.com's entire argument here is two sentences: A God who knows the future is powerless to change it. An omniscient, all-powerful, free-willed God is impossible.
How exactly does this make sense? Omniscient knows He knows all, that means He can see every possible outcome of a given situation based on his interference, so he can make a free-willed decision on what he'd like best, and the limits on what he can do with it are non-existent because of his omnipotence. Again Mr. Docterman's claims are unfounded.