To explain simply what is changed because some confusions are already present in this post:
Blessing isnāt nerfed, it is actually a buff. The duration will be extended to 5 minutes instead of more or less 1min.
Only the Blessing of Pardonner Shop will be nerfed. They will loose any effect coming from Transmit Prana and Divine might when the shop is used. The value of the blessing sold is reduced by 30%. However it will be applied for the whole hour :No hit counts anymore
It is important to note that the interactions of all the AA builds with blessing (and the multiple lines) are reduced. Imo they want to remove all the additional lines from the game to make the damage log more readable.
Concerning the Sacrament change:
The extra line is removed but the increased damage becomes better than blessing (10 points corresponding to a 3.3 SPR^0.9 against 3.2*SPR^0.9 for a lvl 15 Blessing).
Last rites isnāt known yet but it is quite possible than it will be the same as Sacrament.
A lot of Holy damage added.
The good things about the changes is that it will affect all your spells adding more or less (with Blessing and Sacrament gems and a SPR build) 6-7K holy damage on each hit. It will be pretty decent with Aoe like Magnus exorcismus.
Donāt worry about that, Enchant fire will receive the same treatment, line removed and empowered added damages.
Corcerning Chaplain as a useless class:
Imo a SPR Chaplain and a CON Paladin combo could be really strong. The Capella placed in the Barrier will be rendered invincible and will give additional damage mitigation to the tanking paladin (Remember that Stone skin will reduce all the damage by 20% even magical attack). Imo Chaplain will be as useful as it is now.