Srila Prabhupada had no doubts as to why the world is spiritually illiterate.
"Throughout the whole world there are schools and colleges and universities to study the [sic] physiology, psychology, biology, sociology, so many things. But there is [sic] no university, school, college throughout the whole world to understand the soul. Is there any? Eh? You have come from all parts of the world. Is there any school, college or institute to study what is the soul? They have no information even."
(From a Vrndavana lecture, March 17, 1974)