You could try another angle on this. If the South won the ACW that itself could be called a Revolution, and I can see them being fairly theocratic in regards to non Christians.
It's certainly possible, and given all I know of the antebellum South, it's honestly quite surprising that evangelicalism didn't take off earlier, as there was fairly fertile ground for it just about everywhere, including in the lowlands.
I don't really see this. The South, prior to the Civil War was certainly Protestant, but was also renowned as being the least religious section of the United States (with the exception being the Scots-Irish of Appalachia where the Second Great Awakening hit hard ... and those areas were largely pro-Union). It wasn't until the social upheavals following their loss in the Civil War that the South began to develop a strong religious bent. Attempts to depict the Civil War-era Southrons as staunch evangelicals is reading the present back into the past and not a good way of understanding the region at the time.
While I do Hate to seem like a broken record, the truth is, as I pointed out on another thread, the idea, in some circles, that the South was the
least religious section of the United States
all the way up until the postbellum era doesn't seem to be all that well supported, as far as I've seen; indeed, there was indeed already a fairly notable religious bent in the South well before the Civil War started, including amongst the planter classes, and this only greatly accelerated from the 1830s onwards, in no small part thanks to slavery starting to become part of a whole way of life.....while a good bit of the North was actually slowly getting more secular, at least in some ways, for a while.
Honestly, if anything, from all I've read over the years, the difference actually in
how said religiousity was expressed in these areas; yes, it certainly is true that Northerners did, in that era, tend to be rather more open about showcasing their faith to the world(like in the "burned over" areas in Western New York), that much can be said.....while Southerners seem to have largely done without the public proselytizing(I understand some areas of Appalachia were an exception) until after the war.
But if there was ever an era where the South was
considerably less religious overall than the North, it must have been very early in this nation's history, because I've never seen much to indicate otherwise: Best I can tell, at least from about ~1810 and on, it seems to have been roughly equal overall(that said, though, I must admit that I'm less certain about prior to then.).
The South built it's post 1865 religiosity on the color line, the South did not think it needed to justify the order of things using religion; if anything the various Southern white denominations tailored their Christianity to suit the color line.
Actually, it was both: Southern pro-slavery preachers quite often both tailored their messages to promote the color line,
and felt that religious beliefs justified the existence of slavery. So a strong *Fundamentalist movement in a victorious CSA would not at all be out of place, as the conditions & ingredients were already there.