Considering the considerable effort put in to enable Eastshare to be an effective general despite not being a member of the inner circle, I'm absolutely SHOCKED that Cayleb and Sharley tried to make him an inner circle member after the war. Why waste all the effort Merlin went to advising Eastshare in various personas during the war? If they thought that Eastshare's ironclad belief in the CoGA was unshakeable and a huge part of who he was, why risk losing him for the convenience of having him him available for instant conversations and so he could join in the planning for the Big Reveal and general skullduggery?
I never expected them to try to bring him into the inner circle, and I was shocked that they were even discussing it. Their "unbroken" string of success went to their heads I suppose. (Although Sandaria's "conversion" is still iffy in my opinion.)
RFC uses this debacle to show us the unbreakable grip that the CoGA has on a HUGE percentage of Safehold's population. Eastshare wouldn't even LOOK at TF tech or read any of the vast library of information that was made available to him because he knew down to his bones that all of it was the work of Shan-Wei, and that the "demon" Merlin was tempting him with it. (Can you say "Cognitive dissonance?)
How is the Big Reveal supposed to sway the minds of people who refuse to open their eyes to the Truth when it's shown to them clearly and in a manner they can understand? When they believe their very souls would be in jeopardy if they so much as look? When they consider everyone who accepts the Big Reveal as heretics and blasphemers worthy of the Punishment of Schueler?
The Jihad will be nothing compared the the Holy War(s) caused by the Big Reveal. RFC has mentioned this several times - that the wars resulting from the inevitable schisms that split from the CoGA would be vastly worse than the war for the survival of Charis and its allies.
A bunch of us predicted that the WORST outcome of the war from Merlin's point of view would be Duchairn gaining control of the CoGA and reforming it to what almost everyone on Safehold believes it should have been all along. Unfortunately, that's exactly what happened. How does one fight against a religion that you ostensibly agree with once again?
Yes, the Church of Charis (and presumably the Church of Siddarmark) will exist, mostly because of the bitterness the survivors feel due to millions being slaughtered by the troops of Mother Church and the Inquisition, or who died fleeing the war or starved or froze to death due to the privations it caused. The fury they feel towards Mother Church will make it impossible for them to ever reconcile with the CoGA that did that to them and their families, and by extension their entire country. (Siddarmark and every member of the Empire of Charis.)
Toss in North Harchong, (I haven't read ahead of this snippet so this is all conjecture) whose church hierarchy were happy with the former CoGA and all the lovely graft it allowed them to skim from the system, and you have the setting for a massive slave revolt, even before the news that the slaves of the Mighty Host are never coming home because they're too dangerous to the status quo. That's going to tick off EVERY family member and extended relative whose father/son/brother/cousin/etc. went off to war, and for all their loved ones know, are still hale and hearty and just as dedicated to Mother Church as the day they left, yet the CoGA won't allow them to return to their loved ones. This is going to get UGLY!
It will REALLY get ugly if a sizeable number of the Mighty Host manage to return to North Harchong, especially if they bring their weapons with them. The slaves have been kept in check so far because they only have slings while the police force has guns and cavalry with bows. (I'd guess they carry pistols by now.) Imagine those enforcers charging their horses into a line of ex-Mighty Host soldiers armed with the latest CoGA rifles. (There's a lovely scene from the invasion of Corisande that shows in lurid detail what happens when cavalry charge a line of riflemen!)
The plantation owners are DEAD if the army/police and their overseers can't protect them from the slaves they've abused for their entire lifetimes, so all of North Harchong is a potential bloodbath that has nothing to do with the CoGA. Once the overlords are slaughtered, how do former slaves govern themselves? How do hundreds of millions of people keep from starving to death when the social structure has been destroyed and there are likely to be millions of refugees scattered to the winds, looking for their next meal? What begins as a slave uprising could devolve into complete chaos and warlordism.
Fortunately the teachings of the CoGA might have a wee problem surviving a result like THAT - given a few generations. (Refer to the Pirates of Trellheim as an example - based on their behavior and the fact that they likely have little or no oversight from the CoGA, they may be as close to agnostics or atheists as can exist on Safehold.)
No, the Big Reveal won't do the citizens of Safehold a lot of favors for a few generations, and it won't until the true believers either die out, are purged, or become willing to accept the truth or at the very least agree to live and let live. Meanwhile, a whole lotta people are gonna die.