"Faith of Our Fathers" is a science fiction short story by American writer Philip K. Dick, first published in the anthology Dangerous Visions (1967).
Tung Chien is a Vietnamese bureaucrat in a world that has been conquered by Chinese-style atheist communism, where the population is kept docile with hallucinogenic drugs.
This appears to me to be a true new frontier; to a certain extent the religious experience can now be scientifically studied... and, what is more, may be viewed as part hallucination but containing other, real components.
Science fiction, always probing what is about to be thought, become, must eventually tackle without preconceptions a future neo-mystical society in which theology constitutes as major a force as in the medieval period.
Such a penetrating—and Zen—mystical view, arrived at so long ago, will be hard to top; in my own experiences with psychedelic drugs I have had precious tiny illumination compared with Erigena.