The weakness of modern religion is its obsession with sin, G.K. Chesterton once observed. "A modern morality," he wrote, "can only point with absolute conviction to the horrors that follow breaches of the law." And so it has been with the religious conservatives who have overwhelmed the latter-day Republican Party. For preachers like Jerry Falwell, James Dobson and Pat Robertson, the prospect of hell has always been far more vivid than the possibility of heaven. Presidential candidates like Robertson, Pat Buchanan and Gary Bauer have loaded up on the "Thou Shalt Nots" and rarely, if ever, mentioned the grace and serenity that come from doing "for the least of these."
But there is a striking change in the 2008 Republican presidential field. There are two candidates with strong religious credentials, Senator Sam Brownback of Kansas and former Governor Mike Huckabee of Arkansas, and both spend far...