Dark Universe

"Another first-class example of the right sort of science fiction is Daniel F. Galouye’s “Dark Universe.” Here the intuition being pumped concerns mythology and the origins of religion."

"The people of this sci-fi novel live underground in darkness. They retain ‘light’ in their language, but only in allusions to a lost paradise. They worship Light (‘For Light’s sake!’), and their theology includes demonic figures that engineered the fall from Light’s grace. The demons are called Strontium, Cobalt, and the arch-devil, ‘Hydrogen Himself.’ Go figure, as you Americans say."