Could the ancients who heard God speak have been actually hearing their own nascent cognitive mind?

In a 2007 update of his 1996 book, The Origin of Consciousness in the Breakdown of the Bicameral Mind author and psychologist Julian Jaynes explores further his disturbing but thoroughly fascinating theory of human brain bicameralism.
http://en.wikipedia.org/wiki/Bicameralism_(psychology).

In 2007 he published a series of essays, Reflections on the Dawn of Consciousness: Julian Jaynes’ Bicameral Mind Theory Revisited. further exploring his theory.

Jaynes posits that humans as recently as 3,000 years ago did not think like we do today. He theorizes that experiences and memories from the right hemisphere of the brain were transmitted to the left hemisphere (the portion handling day to day routine activities) as auditory hallucinations. In studying ancient religious texts, he finds confirmation for this. Perhaps the fathers of the world’s great religions really did think they heard God talking to them.

Jaynes says that only as man developed written language and delved into deeper thought did the two hemispheres evolve to today’s point of integration, and that the evolution is probably not yet complete. He believes that in another 3,000 years, average brains will be capable of the incredible feats of thought we now find only in profoundly gifted savants.

An example of the split brain most of us have experienced is when you are driving on a long trip, and the freeway is mostly devoid of traffic. We can suddenly seem to awaken from a reverie to find that our unconscious mind has safely driven 50 miles while our conscious mind was occupied with thoughts completely unrelated to driving a car. A more powerful and disturbing example is schizophrenia, where one part of the mind consciously hears voices from another—voices that seem for all the world to come from beyond the schizophrenic’s head.

It’s a disturbing but strangely compelling theory. What are your thoughts?