Wasn't the koran written based on voices heard in a cave???
Islam is what Julian Jaynes had in mind when he wrote The Origin of Consciousness in the Breakdown of the Bicameral Mind
From the Julian Jaynes Society website:
At the heart of this book is the revolutionary idea that human consciousness did not begin far back in animal evolution but is a learned process brought into being out of an earlier hallucinatory mentality by cataclysm and catastrophe only 3000 years ago and still developing. The implications of this new scientific paradigm extend into virtually every aspect of our psychology, our history and culture, our religion—and indeed, our future. In the words of one reviewer, it is "a humbling text, the kind that reminds most of us who make our livings through thinking, how much thinking there is left to do."
Presents a theory of the bicameral mind which holds that ancient peoples could not "think" as we do today and were therefore "unconscious," a result of the domination of the right hemisphere; only catastrophe forced mankind to "learn" consciousness, a product of human history and culture and one that issues from the brain's left hemisphere. Three forms of human awareness, the bicameral or god-run man; the modern or problem-solving man; and contemporary forms of throwbacks to bicamerality (e.g., religious frenzy, hypnotism, and schizophrenia) are examined in terms of the physiology of the brain and how it applies to human psychology, culture, and history.