I think we should make it a prestige class (Ascetic) and give it the same/similar prerequisites as the Saint Prestige class
Alignment: Any
Abilities: Wis 15+, Cha 13+
Special: The ability to cast Divine Spells from the second level.
Base Bonus Attack: +3
This could be a separate (darker) path for deities of non-good alignment. A sort of mirror for the Saint prestige class
Get rid of the spell like abilities (Endure Elements, Sustenance, Greater Sustenance, and Freedom of movement) and replace them with conditional bonuses to the relevant saving throw for what those abilities protect you from (ie. you can function normally in extreme weather conditions, but not forever; you can survive without food and water for longer than normal, but not forever; you get a bonus to reflex saves when attempting to be held/grappled/entangled)
Also, you would not be able to combine this prestige class with the Saint prestige class or, let it be able to be combined but make the Saint prestige class Epic so players can't take it before level 20