Tribunal
Almalexia
+5 Endurance - unchanged
Vivec
+10 Luck - unchanged
Sotha Sil
+5 Intelligence (was +5 Magicka). The new blessing is more in line with standard +5 Attribute blessings, and generally more useful.
Vivec's Fury
5 Fortify Attack - unchanged
Tribunal Saints
Aralor
+5 Agility (was +5 Personality). He was a repented criminal, and Agility is an important attribute for many criminals.
Delyn
+5 Speechcraft (was 10% Resist Blight Disease). He "was the head of House Indoril, as well as a skilled lawyer and author of many treatises on Tribunal law and custom", so he most likely was very skilled in Speechcraft.
Felms
+5 Strength (was +5 Restoration). He was a fierce illiterate warrior, so he doesn't have anything in common with Restoration.
Llothis
+5 Personality (was +5 Willpower). He is an archetypal priest, and Personality is a very important attribute for priests.
Meris
+5 Restoration (was 10% Resist Corprus Disease). She was a healer. The vanilla blessing was completely useless without mods.
Veloth
+5 Willpower (was +10 Magicka). He is a prophet who led Chimer to Morrowind.
Nerevar
10 Sanctuary (was +20 Fatigue)
Olms
10 Shield (was 10% Resist Common Disease). He is the founder of Ordinators.
Rilim
+20 Fatigue (was +5 Endurance). To get +20 Fatigue, you need to get 20 Strength + Willpower + Agility + Endurance.
Roris
+5 Merchantile (was +5 Health). He is a patron of furnishers and caravaners. It means that he likely was a merchant.
Seryn
20% Resist Poison, Common, Blight, Corprus Disease (was 20% Resist Poison). It makes the blessing less niche and more universally useful.
The text of The Consolations of Prayer (where the blessings and their effects are listed) is edited to match the new effects of blessings.
Changes only the effects of the blessings and the text of The Consolations of Prayer. Compatible with OpenMW.
I also made a mod which adds blessings of Divines to Imperial Cult shrines and blessings of Good Daedra to the shrines of St. Veloth. It's fully compatible.
https://www.nexusmods.com/morrowind/mods/50444