Like a mighty army moves the church of God; Brothers, we are treading where the saints have trod. We are not divided, all one body we. One in hope and doctrine, one in charity. -- From the nineteenth-century hymn "Onward, Christian Soldiers" What keeps America a country of religious practice and traditional values? How has the U.S. avoided suc-cumbing to total secularism? The answer to these provocative questions is found in the religious commun-ities of America today: In the past thirty years, the religiously active voter has migrated to the Republican Party, and the story behind this shift,...