Yes, Christian faith...you might do well to examine the picture more closely before dismissing the proposition. It so happens that, due to the efforts of Lee and Jackson, there was a revival among the troops under their command, who came to a genuine faith on the battlefield that they didn't have before the war.
A lot of folks in the South took the loss of Jackson at Chancellorsville and the loss of the battle of Gettysburg as signs that God's blessing was being withdrawn from their cause.
As for worshipping their earthly institutions, I wouldn't recommend judging them too quickly for that shortcoming; they are not the only ones who could be so charged, and they did eventually accept the final outcome.
They didn’t win. That is a matter of faith in particular. Examining the picture more closely does not entail listening to propaganda but examining this bare fact.