The only priest feat I can remember was a cermemonial one in Arcana Evolved. It basically said you'd had religious training and had been ordained as a priest/priestess.
Requireemnets were wisdom 11, knowledge religion and a truename (arcana evolved special rule that could proabably be ignored).
Gave you + 2 to bluff, diplomacy, intimidate and gather information when dealing with people of the same religion. It couldn't be taken by races or cultures with no organized priesthood and presumably let you perform marriages/coming of age ceremonies/funerals and the like.
EDIT
Can't remember offhand what ceremonial did it was either you had to go through a specific ceremony to get it or you could get it by performing a ceremony and thus save one of your free feats for something else.