Religion for the day

From "Deathworld" by Harry Harrison:
The barbaric religions of primitive worlds hold not a germ of scientific fact, though they claim to explain all. Yet if one of these savages has all the logical ground for his beliefs taken away, he doesn't stop believing. He then calls his mistaken beliefs 'faith', because he knows they are right. And he knows they are right because he has faith. This is an unbreakable circle of false logic that can't be touched.