You can read the entire article at Thinking Christian.
What would I do with my morality if it were proved that God didn't exist? Wouldn't I still want to pursue justice?
No, doctor(logic), I don't think I would. There would be no reason for me not to pursue my own pleasures above all else, and I believe I would recognize that and act accordingly.
You have to understand, this is not a new question for me. I faced it many years ago when I doubted there was a God. I recognized then that there was no restraint or constraint on me; that if I raped my girlfriend the only issue would be whether I got caught. I think a lot of young men today are raping girls (date rape) and only worrying about whether they get caught. Whatever I did, the only questions would be, "does it bother me I did it?" and "will I get caught?" If it didn't bother me and I didn't get caught, then I could do it freely for my own satisfaction.
Here's a video on the subject as well: