There isn't really one, but Zeus is the king of the gods, the chief of the gods. So I guess you could could say he is the god of the gods, even though he really isn't.
Zeus (Zeus was merely the most popular of the big three. He shared power with Poseidon and Hades.) In the Levant the chief God was El. In the Babylonia Pantheon it was Marduk. there was no greek gods...
It depends on if you believe in Greek gods or the Christian god. If you are Christian, the Christian god is the god of everything and everyone. If you believe in the mythical Greek Gods, then Zeus is...
Nothing can 'create' God. But God can create anything. I guess you're caught between a hard rock and a boulder. An immovable wind and an unstoppable rock.