See, you'd think that the priest is carrying out the devil's bidding, but the kid is the one with the "devil's mark" on him, and he's the one who can only heal by stealing life from something else. The priest, in the meanwhile, seems to receive his gift from god - he can do what he wants with no problems, and he seems to be doing a good deed.
I want to know who or what the Management is, though.
The battle between good and evil was mentioned at the beginning of the first episode. They seem to have representatives of each do battle in each generation.
That's what I figured at first (they're opposites, and will fight eventually), but the dream in the second episode lead me to believe that they parallel each other somehow.