You have been ordained as a minister of some religion. A cleric has a number of powers and privileges that a layman lacks, including a
+1 reaction bonus from co-religionists and those who respect his faith. He or she will be addressed by a title -- Father, Sister, Rever-end, Shaman -- and can perform such ceremonies as Confirmation, Marriage and Exorcism.
Remember that not all clerics are nuns or rabbis. Aka'Ar, high priest of the unholy Cult of Set, is a vested priest as well, and the blessings and marriages he performs will be just as meaningful to his own flock as are those of a vicar to his parish. And, if Set so wills, Aka'Ar will be able to perform exorcisms as potent as those of a Christian minister, if not more so. Aka'Ar will have a better working knowledge of demons...
The GM should determine whether clerics, in his campaign, can call upon active aid from Beyond. If so, and if clerics are known to be able to get such aid, Clerical Investment will be worth 10 points or more. If Investment is merely (as far as the players know) a "social" advantage, it costs 5 points.