I have played ATW for like 300+ hours and I thought I understand every aspect of how the game works, but I could not find the cause of the issue I mentioned below.
I am playing my Lakhmid campaign for about 125 turns. I haven't noticed when it actually starts, but I had this +10 religious influence from Eastern Christianity (which was my state religion before I swapped to Zoroastrianism) for 10+ turns already that came from an "event" that is nowhere to be seen. I checked my records but there was neither events nor missions that relates to Eastern Christianity and I have completely no idea what triggered it.
Every province I owned (including freshly conquered) would have this +10 influence from Eastern Christianity. Even I changed my state religion to Zoroastrianism, there is still +10 religious influence from Eastern Christianity that I can't get rid of it.
Does anyone have an idea what it came from?