Hades- a previous incarnation of Good Guy Satan>>>> I'm lucky to have him as my Godly parent.
You kill a god like you kill an idea. A god can't survive if nobody knows they're a god; if nobody offers tribute, or prays to, or believes in a god, they're not really a god, are they? They're just-potentially-immortal beings with some possible powers that everyone else has forgotten. Not very god-like then.