Until the mod is properly continued, I've managed a quick-and-dirty fix using "More Tenets - Updated by Polytheism Reborn" mod, which is the up-to-date version of More tenets.
0. Go to offline mode to prevent updating while you tinker with files. As usual, back up the mods somewhere
1. from Godherja folder (mod 2326030123), go to common/religion/doctrines and copy the file 00_core_tenets.txt.
2. in the More tenets folder (mod 3085182185), again go to common/religion/doctrines, and paste the file from the step 1.
3. In the same folder, open the xxx_mts_core_tenets,txt and copy everything from the start till the following line:

# Christian faith tenets #


4. Now open the 00_core_tenets,txt and replace everything before the (same) line

# Christian faith tenets #

with what you've copied. Save and close the file.
5. Delete xxx_mts_core_tenets,txt, then rename 00_core_tenets,txt to xxx_mts_core_tenets,txt
6. Enjoy!

I've to apologize for my long absence. For personal reasons, I was unable to maintain my mods. For the same reason, I hat to stop playing Crusader Kings III. Everybody is free to use the code for their own mods.

My Pleasure!

Thank you king