"It ought to be possible to live a Christian life without being a Christian," laments Roy Hattersley, a columnist for the U.K. Guardian. An outspoken atheist, Hattersley came to this conclusion after watching the Salvation Army lead several other faith-based organizations in the relief effort after Hurricane Katrina.

"Notable by their absence," he says, were "teams from rationalist societies, free thinkers' clubs, and atheists' associations—the sort of people who scoff at religion's intellectual absurdity." According to Hattersley, it is an unavoidable conclusion that Christians "are the people most likely to take the risks and make the sacrifices involved in helping others."

Hattersley also notes that this pattern of behavior goes beyond disaster relief:

Civilized people do not believe that drug addiction and male prostitution offend against divine ordinance. But those who do are the men and women most willing to change the fetid bandages, replace the sodden sleeping bags, and—probably most difficult of all—argue, without a trace of impatience, that the time has come for some serious medical treatment.

"The only possible conclusion," says Hattersley, "is that faith comes with a packet of moral imperatives that, while they do not condition the attitude of all believers, influence enough of them to make [Christians] morally superior to atheists like me."