As a note, the priest mentioned was intended to be the high priest (standing near the altar in-game), though it wasn't explicitly stated.
I tried working around using him at all, but I needed some kind of input from someone else. Hope it isn't too much. If it is, I'll try to work around it, though.
Edit: Apparently he's not the high priest, I think. He's some Leidanos guy. I was told he's a friendly, open fellow who would be most likely to approach the strange half-elf kneeling at the central altar.