It was in RoCo I, yes, and it included Marriage and Burial and suchlike, however such spells only conferred the approval of the God on the ceremony, and did not list any concrete benefits. I don't think such "Ceremonies" spells should be any cheaper to learn and cast than any other spells... but on the other hand, I think they should confer benefits making them equal in value to other spells, too. I mean okay, a +5, say, vs. being possessed or turned into an undead isn't much... but on the other hand, a single casting confers that bonus for the rest of the target's life, so long as they are active in the caster's religion, and it can be made cumulative with other ceremonies. 4 castings and you get a +20 or so bonus forever. It can add up to a medium powerful advantage.