The notions that SA will be destroyed simply because some of the borders might be redrawn is really a hysterical observation. Especially since no Niselurian will purposefully destroy any temples or arrest any priests unprovoked, as has been ordained by Leopold to his nobles. After all, the war has not yet even properly developed and from my perspective it will be an even one - which was my goal all of the time for easy gangbangs are not what I envisioned for Dwilight. No need to go crazy and threaten with leaving the game; that's just bad sportsmanship. The excommunication that occurred is likely to have worse effect than what the Elders hoped for. In fact, with this they are probably destroying the Faith faster than Leopold ever could even if he wanted to. I guess time will tell, eh?
The fact that some are being judgemental about the Niselurian casus belli is really a negative approach to the game events. I have done massive preparations for this, tried to involve everyone IC as much as I could and done the best I could to tell a believable tale. Granted, I didn't manage to do it perfectly for that would take double the time. Time which I don't always have. But if our casus belli is not to your liking, then tough luck. Until you can do it better your objections don't really matter. Browsing over European history everyone could find similar wars based around these sort of events, so I believe it has been done in the spirit of the game and SMA. In the center of the war is the clear distinction between two sides thinking they know better what the faith is, and have decided to battle over it.