To whet your appetite, here's my favorite passage:
[A]theists are commonly accused of moral relativism: of thinking that there are no fundamental moral principles, and that all morality can be adapted to suit the needs of the moment.
But it isn't atheists who are saying, "Well, sure, genocide seems wrong... but under some circumstances, it actually makes a certain amount of sense." It isn't atheists who are saying, "Well, sure, infanticide seems wrong... but looked at in a certain light, it really isn't all that bad." It isn't atheists who are prioritizing an attachment to an ancient ideology over the clearest moral principles one can imagine: the principle that entire races ought not to be systematically exterminated, and the principle that children ought not to be slaughtered.
I have just one question for William Lane Craig: how do you muster such sophistry that allows you to defend the sanctity of life and, at the same time, defend the extermination of innocents?