As a side note, I never found the cults in Fallout that interesting. The Master and his goons were good, but that was it for me. I put the rest in the same category as the BoS, the Enclave, and to a certain degree Super Mutants. I'm more interested in the life of your average wasteland scumbag than the MYSTERIOUS HIGH-TECH SUPER POWERFUL FACTION OF THE WASTES.
I didn't mention Guardians just because they represent no real force in my opinion.
I dont like that Idea, like imagine the whole wasteland controled by someone? That would ruin everything...