Yeah, that shows that even a modern mind can be temporarily switched into the bicameral mode under a proper combination of circumstances and beliefs (i.e. a ritual).
Ancient Greeks used rituals to initiate illiterate girls into speaking prophecies. Some African tribes use rituals to create zombies (unconscious slaves). Modern Christians use rituals to initiate believers into speaking gibberish, or falling on the floor. Hypnotists use rituals to make volunteers on the stage believe that they are chicken.
These are all different cultutal variations of the same thing: high social pressure can activate the bicameral mode in a modern mind. There are differences in how easily a mind will succumb to such pressure; and the difference probably has a biological component. In schizophrenia, the bicameral mode can activate spontaneously.
It seems to me you're putting too many equal signs between things like schizophrenia, religious (in particular, mystical) experiences, altered states of consciousness including the drug-mediated ones, and the bicameral mode of thinking.
Not all unusual mind states can be fit into the bicameral mold.
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