This novel, one of my favorites in the science-fiction genre, belongs to the catastrophic subgenre, also called post-apocalyptic. This is its summarized argument:
An atomic war has destroyed our civilization. After the catastrophe, the surviving masses hate science and books, considering them responsible for the tragedy. In the same way as after the fall of the Roman Empire, the Catholic Church collects the remains of knowledge and preserve them for posterity, so they can be used by a new civilization, capable of understanding them, if one day it would arise. But when this happens, history repeats and man self-destructs again.