This documentary shows how stimulating the brain in a certain way can produce an experience with very similar characteristics to those of a religious experience.
Does this show that religious experiences cannot be genuine?
I don't think it goes that far. It does show that a scientific explanation of the experiences is possible and as such, bring more doubt as to the authenticity of such experiences but it doesn't prove they are not genuine.
After all, taking hallucinagenic drugs may make you see beautiful butterflies flying in front of your eyes, but this does not mean that whenever anyone claims to see beautiful butterflies that we must assume that the butterflies are not real.
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