From the back of the book:
This is a Guide to the Heavens
This sourcebook contains the gods of dark elves, orcs, minotaurs, trolls, and even monstrous aberrations that have no religion. 16 different races are detailed within, providing DMs and players with information and rules about the divinity of their adversaries. Each chapter details a separate race, with enough information to fuel an entire campaign or just a few evenings of gaming.
The secrets of divinity are at hand.
The Righteous Shall Prevail
19 prestige classes
16 temple maps
Over 60 magic items
Complete backgrounds on over a dozen religions
Complete NPC priests each race for [sic]