The Eshlar are monotheistic. They talk about the One a lot. Just like all the other cultural aspects, lots of players will ignore all this completely. Not that I know of. Well, the Eshlar believe that only matter really exists as a lasting part of the universe.
Energy is ephemeral and only useful when it's being channeled to create or shape better matter.
Also, I imagine some of the priests may have funny hats. It seems to be a universal constant.