Dei Agminum (Armies of God) is an ambitious mod project aimed at becoming the premiere Medieval II Total War Crusades mod. Its origins can be traced back to the Broken Crescent Submod "Jersualem Rising". It will use the Crusades campaign from Kingdoms as a base but will in time morph into its own distinct entity. For now I will concentrate on revamping the Crusades campaign through this mod. This will include renaming existing units, settlements and factions with their historical names, introducing historically accurate buildings and new units and completely remaking unit art/UI (models, textures, banners, screens and etc.) and introducing other assets. For now these are the mod's main priorities.
In the next version you will be able to implement religious tolerance policies throughout your lands. And there will be several new religions including Judaism, Coptics, and Greek Orthodox (Eventually we will split Islam into Sunni and Shia). If you extend tolerance to religious minorities you allow these communities to prosper and thrive under your rule. Your policies of tolerance will allow for these communities to come out of the shadows and to build their places of worship.
Building their places of worhsip will add to your cities' overall prosperity as it signals that religious minorities are doing well. As such you will able to accumulate more income from your cities as these communities grow and develop themselves. However building these houses of worship will increase religious strife as the religious majority in your lands will be threatened so there will be higher unrest in cities with such buildings. The percentage of other religions will slowly increase in your cities offsetting your faction's main religion. And so you must shore up security in these cities and maintain law and order.
Here are some of the religious buildings available to the Crusaders: A synagogue, a Greek Orthodox church and a mosque.