The changes made in Crusader Kings 2 2.8.3 (and subsequent hotfixes) do not require a new version of Christianity Mod. Version 1.8.1 of the mod will work just fine.
An adult mod for Crusader Kings 2
The changes made in Crusader Kings 2 2.8.3 (and subsequent hotfixes) do not require a new version of Christianity Mod. Version 1.8.1 of the mod will work just fine.