Well, I suggest a priesthood skill tree, because be a priest is a integral time job. (Faith should be a separated thing.)

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0: You can perform mass at church or in open terrain. People in the moment receives a buff of 1 luck during 1 in-game day.
30: You can operate the confectionery. People who prays there receive twice as many alignment points. Only works if people have -1 or less alignment. People can pray in a confectionery once a week.
60:You can perform mass at church or in open terrain. People who pray during the time receives a 1 + (0.25 * 0.01*(placeholder name) Skill points) bonus on alignment. Can perform it once a week
90: You can perform mass at church or in open terrain. People in the moment receives a buff of 3 luck during 1 in-game day(overrides lvl0 buff).
100: You can perform marriages.

-Priesthood
0: You can pray for a person, increasing it happiness (I saw this in another suggestion and I liked the idea). It works once at day.
30: You can forgive someone sins. (Mechanic later on). Works once at in-game month.
60: You can bless religious trinkets, giving it a 2 luck buff for an in-game month.
90: You can excommunicate someone with -50 or less alignment. Excommunicated receives a -5 luck bonus in all chores, and cannot increase their alignment until 3 another priests forgive their sins.
100: Your blessed trinkets gives 2.5 luck bonus

This add churches ( chapels, Churches and Cathedrals), add a attribute happiness and a roleplay mechanic of marriage(maybe a fancier priest cloths), and a new type of jewelry.
Well, I need suggestion and feedback.
Thanks for your time.