
Originally Posted by
kosmosje1
Perhaps many of these heretics are actually failed Imams. They were actually sent to clear out a particular high-piety heritic and the problem spread from there. I have had such an explosion of heritics occur on an island where my uber-priest suddenly turned heritic and I had to battle him purely with my 1-piety priests (I just stacked them, and then used them to train a heritic persecutos). At a time, I believe I had 10 heritics on the island and I was very glad the settlement there was a castle I had massacred.
So that could explain it as well. Some of those heritics simply turn anything under 4-piety into a heritic with ease. And in high-piety (non-heritic) areas, this will amount to a quick gain in piety for those heritics.