Here's a question you should be asking: If there IS a God, and he's all-powerful and all-knowing, and he created the entire Universe and set everything in motion according to his plan and his alone, and he's 100.00% in control of everything and nothing can happen if he doesn't want it to, can free will truly exist? Seriously, there's nothing more doggedly (and depressingly) deterministic than a universe ruled by a god whose prophets have already told us (albeit rather vaguely) how everything will end no matter what any of us want or choose to do. Physicists also have a deterministic outlook, but at least they admit we don't really know what's going to happen.