When theists try to assert that we atheists just hate god, and really do believe, they sound to me like they're trying to convince themselves of this. It's a threat to their own belief if others can be non-believers, so they make up stories about us being haters-but-believers, because what else CAN they do? It's an act of self-defense; to do otherwise would force them to confront the weakness of their position.
Responding to this video: http://www.youtube.com/watch?v=9UK3F7d8mWU
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