When taking my first Hebrew Scriptures course, our professor, Grinnell College Chaplain Dennis Haas began a lecture with a display of this book, saying how he had been shocked by its thesis that the roots of Judaism and Christianity were in a psychedelic fertility cult. John Allegro, its author, he noted, was a very well respected scholar, one of the first involved in the study of the Qumran scrolls. That such an expert could make such claims was quite upsetting.
Years later, having gotten two degrees in religion and having read some of Allegro's other work, I returned to this book, hoping that I now knew enough to evaluate it.
I did not. To critically appropriate Allegro's arguments one must be master of a whole host of ancient languages, beginning with Sumerian, the oldest written language known. Although I'd picked up some Greek, I'd not even begun to study Hebrew, not to mention the other, older languages.
What I could appreciate, however, was Allegro's defense of the notion that much of what appears to be obscure and outrageous ancient religious literature is, in fact, experientially based and relevant to the concerns of real life. In other words, the use of psychotropic plants could certainly result in strong beliefs about other worlds or dimensions, even of other sentiences, and fertility is certainly of major concern to all agricultural communities.
While this book will be beyond most readers as it was for me, most of Allegro's other works are quite accessible.