A quick read about Utilitarianism on wiki can give them a perfect example of how many atheists look at morality. Here, I'll even help them out:
http://tinyurl.com/r6l7b
Reading about Secular Humanism wouldn't hurt them either, as most secular humanists tend to be either atheist or agnostic, and yet seem to be a bit more moral than most christians I have encountered.
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