EDIT: Apparently I wasn't fast enough in writing this message :|
1) I'd probably have the Holy-3 UberBishop as prophet, because then he gets to reanimate lictors :O (atleast it was that way in dom2, haven't tried this in dom3)
EDIT: And how could I forget about Etimmu. If you have any sort of bless, give it to etimmu. He is the true destroyer of worlds.
2) If they are similar to what they were in dom2, then they are pretty good, especially when you reanimate them for free
Try and get a few and see how things go and decide for yourself, that's the best strategy in figuring dominions out
3) Holy skill affects the amount of spawns generated by the Reanimate command. It also allows better spawns.
4) Nope. It does effect summoning spells that specifically say it does.
5) Resources are the resources and man-labor requiered to create equipment for units. What more do you need?