The only thing I claimed the beliefs of Lincoln and Jefferson were evidence for is that God's judgment on nations was standard Biblical theology ...
Well, if you like. Though it would be hard, I think, for you to prove that Lincoln and Jefferson were standard Biblical theologians. If you just want to prove that "God's judgment on nations was standard Biblical theology" then you might cite more standard Christian theologians.
But if you want to prove that "God's judgment on nations" was the actual cause of the civil war, then you need to do better than that. You need to prove that that's actually true. This is a long way from proving that Lincoln thought it was true.
So it may be true that that's what Lincoln thought, but what Lincoln thought has nothing to do with it. Lincoln may have been wrong, like Hitler and Julius Caesar may have been wrong. His opinion isn't evidence.
Edited by Dr Adequate, : No reason given.