TRINITY CHAPEL in suburban Atlanta’s Cobb County is hardly the picture of a revolutionary outpost. It’s a stylishly modern Church of God—a denomination that, though conservative, is certainly mainstream. Parishioners are drawn from a community whose average income is a comfortable 35 percent above the national norm, whose tree-lined country roads intersect McMansion subdivisions....Reconstruction—an obscure but increasingly potent theology whose top exponents hold that Christian crusaders must conquer and convert the world, by the sword if necessary, before Jesus will return....Reconstruction has slowly absorbed, congregation by congregation, the conservative Presbyterian Church in America (not to be confused with the progressive...