The Republican candidates all claim to be devout Christians. But between the compassionate teachings of Jesus and their coldhearted, mean-spirited ideology, there is a great gulf. Whether Gingrich and Romney’s callous attitude toward the least among us will hurt them with the 78 percent of Americans who claim to be Christians is uncertain. From the 1925 publication of “The Man Nobody Knows,” a bestseller that depicted Jesus as a successful businessman, there is a long tradition of smug, self-serving Christianity in this country, a Christianity easily compatible with the harshest and most uncharitable values and beliefs. But in their zeal to win over the most resentful, hate-filled members of their party, the Republican candidates run a greater risk. They are turning before our eyes into archetypal villains, bad guys out of our collective cultural memory bank.