While it looks like a cleric book at first sight this is way more.
Of course; clerics, inquisitors, oracles, warpriests and (anti)paladins wil benefit the most, but now you can also make a fighter a soldier of god by taking the sentinel class, or make a Desna rogue and gain access to the feats. The feats, traits, spells and boons make the difference between the gods a lot greater, witch also adds more flavor. In the corebook the weapon and domains where the only stats of a deity, but the fire domain didn't give a character more Asmodues feel, because a Sarenrea priest could take it to. With these Deity specific feats, boon etc. it can become a big deal witch you choose.
The 3 archetypes are all good, divine casters can go exalted, martials can take sentinel classes and everyone can go evangelist.
Now the big deal for me:
As a GM you can at so much flavor:
Example: giving the bad guys in your torture chamber Zon-Kuthon feats, prestige classes and spells.
Love this book.