There are two nearly identical sections of the Bible (in the book of Psalms) that say that atheists cannot possibly do good - in fact, that we do works of abominable iniquity and that we are filthy.
Yesterday, I spent seven hours working with Habitat for Humanity, both working on a couple of new houses and helping gut an old house that's set for renovation.
By Christian doctrine, what I did was a terrible thing and is not worthy of praise. By my own judgment, I did something that helped provide a real, material benefit to real people with real needs. I did a good thing. And I'll be looking into getting my atheist group to join me next time.
So much for Psalms...