those are great news, keep going with your very good job!!
I think would be great give some re-training in some major fort of that time...maybe for the mercenary units.
Ayyubid are very powerfull in BC....a lot of money and few enemies. but historical speaking they were a major power in the middle-eat. I think Al-Qahira and Alexandia had a good percentege of the eatern cristians minorieties...
in my campain I take yaldz with the sha army and no other factions control it from the beginning and the Zoroastrionian got almost 70% of the population, so turn back to islam majority by buildi islamic mosques.
In every mod has to be attetion for historical accurancies (events, constructions, units,...) BC has this. but the player can always choose two options: replicate the history path OR try to avoid the distruction of its kingdom by play carefully.
so my suggestion is to fix every non-historical things but leave the room for non-historical decisions for the player, it's a good challenge try to find others solutions...for example I try to play a Shandom campains leaving minorities grow in my land and avoid a hudge conversion policy. just to try: what if?