Elsewhere, I’ve written up the Frozen Chosen as a variant of the Aum Shinrikyo (the religious fanatics responsible for the Sarin attack on the Tokyo subway)
But then I started thinking about other religious fanatics. The following is a “Frozen Chosen” religion which evolved from the original “fanatical group of religious power-seekers” mention on the main rulebook.
This variant has the Frozen Chosen as a Puritan sect: “The Redeemers and Retrievers” (something like the True Levellers)