I had a dream that there was a Christian sect who figured out how to convert heat directly into energy for your body to use. That meant that you didn’t need to have food. Since you don’t need to grow food, you don’t need civilization. That means that, if you have a source of heat, you can literally just spend your entire life praying and worshipping God.
This group found volcanic vents and plopped themselves down in a circle around them, erected reflectors behind them so that they wouldn’t lose heat, and just turned their bodies into praying machines. I heard that their plan was to build a Dyson Sphere of the faithful once they figured out how they could have their bodies survive in space.