Agrest combined euhemerism with official Soviet atheism to explain mythology and religion as distorted memories of aliens. As I discussed before, this was part of a concerted effort by the Soviets to undermine Christianity by providing an atheistic alternative. Such works were inspired by 1950s European ancient astronaut and ufology texts, themselves inspired by Theosophy.
Agrest’s work caught the attention of Louis Pauwels and Jacques Bergier, who included a brief reference to him in Morning of the Magicians (1960) as their warrant for fabricating quotations from the Mahabharata as evidence of nuclear warfare. (I can’t read Russian, so I don’t know if Agrest was the original source for the fabricated Mahabharata text, but I can’t find any reference to him citing it, so I’d suppose not.) The pair translated Agrest’s work into French and ran it in Planète magazine. In Britain, New Scientist ran an article praising Agrest’s ideas as a powerful explanatory theory for understanding ancient history. Due to such sources, Erich von Däniken picked up Agrest’s ideas, and Zecharia Sitchin concurred.