The moral superiority of the atheist
Is there some innate depravity in the Christian religion that guides its believers toward evil? In the case of evils like homophobia and subordination of women, the Bible itself clearly answers yes; in the case of torture, I think it's a bit more complex than that. The number of non-religious people in the US has exploded in the last decade or two, reflecting a large-scale repudiation of Christianity by former adherents. Given the ugly and intolerant character of modern American Christianity, it's likely the most decent and humane who are leaving, while the most depraved and cruel remain devout.
The trend will escalate. What kind of people will stick with a religion whose leaders -- faced with the revelation that the US government has been torturing people, some of them to death (and that many of the victims were innocent people arrested due to mistaken identity or other errors) -- continue to screech that it's allowing gay marriage that represents the worst moral stain on American society? What kind of people will leave in disgust as so many others already have?
So it's not exactly that being a Christian makes you more likely to be evil. It's that being evil, at least in contemporary America, makes you more likely to remain a Christian. Nevertheless, that old claim that being Christian makes a person more moral is now totally obliterated.
I found the above graph via this posting by Andrew Sullivan, a prominent Catholic, self-declared conservative, and vociferous opponent of torture. Sullivan wrestles with the implications, but ultimately resorts to the No True Scotsman fallacy. He doesn't address the rejection of torture by the non-religious at all.