The Original Sin. The worship of his first children by his second-- False idols and suh. The worship of spirits, by mankind.

[ this is such a surreal conversation because he comes from Medieval Fantasy world where if you don't know this sort of stuff you get your face kicked in and also threatening to fight The Maker is Extreme Blasphemy and everyone is doing so casually. ]

But going to find his seat in the heavens is the Second Sin, so I don't recommend that either.