I have run into a major problem with the development of this mod with regards to the Mesopotamian Religion. The unreformed version does not display the creatable religious head like it should, and choosing any conversion option which would create the religious head does not work. I have a few options for either fixing this problem, or dropping the religion entirely and leaving the mod in its current state.

1. Try to fix the problem on my own, which I have been unsuccessful at.
2. Completely rework the religion into another religion group, removing the Pagan reformation option and all possible pagan features.

...and my preferred option:
3. Recruit YOU, the player!

If you have a better understanding of how Paradox coded the Pagan religions for Holy Fury, I'd like to invite you to bugfix the Mesopotamian religion. If you can fix the problem, you will be credited as a co-author of Mesopotamia Reborn. I will let you know ahead of time that I am also still working on a solution in my spare time, and I have also sought out help elsewhere, so don't wait too long to join the team!