Light
The two most popular sources of priestly divine magic (which is quite different from the arcane magic of mages), are the Light and the Shadow. Humans, dwarves, draenei, and to a certain extent blood elves as well, are all known for drawing on their faith in the Light to heal and support their compatriots in battle. Humans and dwarves are members of the Church of the Holy Light, based in Stormwind; the draenei are universally faithful to the extent that they don't even have a separate "Church" organization of any kind; and the blood elves are rather confused about what they believe right now -- many have regained their faith in the Light, but some still believe primarily in power and control as their ultimate religion.
We talked about the Light a bit in the article about Paladins, who draw upon the Light exclusively. Those priests who believe in the Light also draw upon it a great deal in battle just like paladins do. Priests of the Light, however, have a special duty to guide the people around them in social and spiritual matters as much as (or even more than) protecting them in warfare. Common people tend to expect priests of the Light to be upright and moral role-models, even if they do not believe in the Light themselves (although many other adventurers may be much more skeptical after getting out and about a bit).
Shadow
Shadow is a much less understood form of magic. If one merely looked at its use as a type of magic in the WoW game mechanics, we could see it is used by demons, undead, and any sort of generally evil enemy. Yet, even the most Light-fearing, good-hearted of priests must draw upon shadow spells (such as Shadow Word: Pain) in order to do any significant damage to an enemy. A priest leveling up will get into a lot of trouble using Smite to the exclusion of all shadow spells. One could simply ignore the fact that one's priest uses these shadow spells, but it makes more sense to simply find another way of incorporating it into your character's belief system.
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References:
http://www.blogscene.co.uk/wowgamer/24777/WOW+PvP.html
http://wowgame.blogspages.com/?p=11
http://wowgame.blogbugs.org/4400479/WOW-FAQ.html
http://wowgamer.blogbugs.org/4400481/What-else-can-we-acquire-for-our-shaman%3F.html