There's really no such thing as "atheism". All religions have someone at the top. Logically, for the atheist this is man (hence "humanism"), but psychologically, it is the real God, the Author of truth, of the moral standard common to all regardless of exposure to formal religion (e.g. "Thou shalt not murder"). It is this psychological knowledge that God really does exist that fuels their frantic passion against all things theistic. Think of a petulant child covering his eyes and saying "you don't exist and I hate you!"
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Exactly.
It takes a truely twisted mind to hate something they say does not exist.
I'm not sure why religious people have such a hard time comprehending the idea that a person can just be non-religious. I just can't wrap my head around it.