Amazingly some people believe God actually exists, and therefor it's only right for them to do good works for the All Mighty Creator. You shouldn't do it of course, because you don't (Correct me if I'm wrong) believe in God.
My 2 cents.
I am confused. Are you saying Atheist should not follow their moral compass?
Are you trying to say (please correct me if I am wrong, because I sure as hell hope I am) that, unless you are Christian, there is no reason for you to be moral or kind? Because that is a load of shit. Don't get me started on Christianity/morality.
(And to come back on what you said, the Catholic Church [ie, Christians], silently approved of the oppression of Jews by Hitler.
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Personally, I know I'm going to hell, if it exists. I mean, I no morales or ethics and I can't change that, so why should I bother trying to be a better person when I could be a shitty person and enjoy the perks now?
I've tried that, I just never felt good being mean towards a person. I only feel good if I make someone else feel, conversely, I feel bad if I make someone else feel bad.