As this combox is winding down, I found myself asking a question.
Given that we've seen, over and over again, that a worldview system based on an atheist worldview cannot provide an objective basis for morality, why be an atheist?
Let's make this a bit more of an existential question than a strictly intellectual one, for now.
We shall presuppose that atheism is true, for the purposes of this thought experiment.
OK, I'm an atheist.
A well-adjusted one, that is. I don't want to kill anyone, I think it's swell to get along with everyone as much as reasonably possible, I don't like war, I am a male attracted to attractive females, I like hamburgers and sushi and rock music. I'm chillin'. I'm honest.
Also, I have never claimed that my vision of morality is somehow objective, in the words of jdp.
Thus, the consequence of that is that, while I don't like raping and murdering small children, indeed, find it detestable, it's just a DEscriptor. That statement "I don't like raping and murdering small children and find it detestable" describes my personal convictions. I agree with jdp - it has no bearing whatsoever on what others do, should do, or should not do.
Finally, I am confident that death is the end for me and for everyone. There are no consequences beyond this life. My life has value inasmuch as I peremptorily assign it value.
Thus, I must ask myself: Why be an atheist? Why not a Christian?
If I'm a Christian (and again, atheism is true here), then I'm deluded that I have a supernatural friend, creator, and Savior. And I believe that raping and murdering little children is objectively morally wrong. That is, it's wrong for everyone at all times, everywhere, under any circumstances. And when I die, I cease to exist.
If I'm an atheist, then I'm right about there being no supernatural. And while I find raping and murdering little children personally detestable, I recognise that there's no reason to try to prevent others from doing it, though I might do so, thus acting inconsistently with my stated beliefs. But there's certainly no way nor call to say that it's wrong for everyone at all times, everywhere, under any circumstances. And when I die, I cease to exist.
As a Christian, I actually get to act consistently with my stated beliefs when I condemn raping and murdering little children for everyone at all times, everywhere, etc. The atheist may do so but acts INconsistently. And we're both going to die and rot. Maybe I'll go with the worldview that actually allows me to condemn atrocities like this. Life's too short.