During the Civil War, both North and South taught that God was on their side and favored their cause. For Southerners, this meant arguing that God favored preserving the institution of slavery. Southern preachers argued that the South was the last, best hope for Western civilization. It is difficult to overestimate the role of Christianity in providing the South with a religious and ideological basis for secession and nationalistic aspirations.
Read Article: Christianity in the Confederate South: Southern Nationalism and Christianity