If you extend Hammster's argument to its logical conclusion, it implies that all Christians have an overwhelming desire to murder everybody in sight, including men, women, children, and puppy dogs. The only thing stopping them from acting out this reign of terror is that God told them it's against the rules. Atheists lack such a desire, because they have observed history and used reasoning to deduce that such actions are unethical, and therefore they don't wish to cause unnecessary suffering.
If Hammster replies by saying, "Wait a minute! I have no such desire!", the obvious question is, Why Not?
Either you have the desire and are merely restraining it because God told you to, or you lack the desire for the same reasons atheists cite.
Personally, I think the atheists' reasoning is a better description of reality for the vast majority of humans regardless of religious beliefs, but whatever saves the puppy dogs I guess.