Here’s Professor Allen C. Guelzo of Gettysburg College giving a lecture to the Manhattan Institute for Policy Research on religion’s role in the Civil War and whether or not it actually made the war worse.
From the video’s description: “Professor Allen Guelzo talked about the Civil War and whether the conflict brought an end to the dominance of religion in American culture, making the U.S. a more secular nation. He argued that soldiers often had a difficult time maintaining religious sentiments despite moral justifications for the Civil War. He also described the rise of moral relativism since both the North and the South claimed to have god on their side.”
This is another excellent presentation from Professor Guelzo.