religion is not limited to just 1 region.
from my example. a network of shrines with no other pc religion means the numbers just keep going up...
are there other religions preaching in that religion? is that region surrounded by shrines/temples of other faiths? (or for that matter followers?)
a shrine only breaks even if there are certain number of followers in a region. otherwise it loses money. aside from that.. not sure what you are referring to when you mention losing money/losing follower, because i don't know anything about your regions/religions.
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just chked.. avengmil has 2 shrines and lvl 3 temple 14 upkeep, 22 contribution. should be around 90%+ follower atm. 6k odd pop atm... daimons killed 4k. expect when pop recovers the % to remain the same if nothing else changes