A lot of the time theists are shocked that atheists can be good without believing in a god. Or, at least they pretend to be, who knows. They usually ask something like “what’s stopping you from going out and murdering and raping people without believing in god?”. Unfortunately, this argument isn’t an argument against atheism, it’s an argument against theism.
By way of analogy, say you have two kids. For one of your kids, the only reason that he doesn’t take cookies from the cookie jar is due to fear of punishment. The other kid, she doesn’t take cookies from the jar because she knows it will ruin her appetite. In this scenario, which kid is the better kid? Which kid would you want as your own?
In this analogy, the kid who doesn’t take cookies because of fear of reprisal is the theist. And the kid who doesn’t take cookies because she knows it’s bad for her in this context is the atheist. Most parents would want the atheist kid in this scenario, yet somehow in real life the theist kid is the one who gets respect.
Seems exactly backwards to me.