If you're going to assume that dwarves have a non-deific divine tradition, you cleaving pretty harshly from the established lore regarding Cerilian dwarves. What with the whole jazz about elves not having clerics because they don't believe in the Younger Gods or don't have a creator-deity etc. (choose your own reason) and the rumours that True-blooded awnsheghlien can grant certain spells to their clerics without being gods themselves, you may have a very difficult path to tread if you decide that somehow your variant dwarves are receiving divine spells from a third source.