It might help to conceptualize the issue not as the brain having the mystical experience, but as the subject having the experience.
The brain is a physical organ. The brain is someTHING. The subject is someONE. It is a category error to mix the two and say “we are the brain”. The religious experience does not happen to the three-pound organ in our skulls. Only the neural correlates of the experience happen in the brain. The actual experience and its meaning are the direct experience of the subject. And the experience’s
source can in many cases cogently be ascribed to the Spirit based on the principle that the mystically-triggered brain is observing a real, though non-material, reality.
Therefore, even if psychotropic/psychodelic drugs trigger the correlates of mystical experience in the brain, what the subject experiences happens at a different level.
So what if some drugs trigger a mystical, beatific, unitive spiritual experience? It’s not necessarily the drugs or their brain-triggering that matters. What matters is the subject’s subjective experience.
The jury is - and will probably always be - out on this issue: If mystical experience is an opening of the “doors of perception” - whether or not drug-triggered - then the question is primarily perceptual. And if it’s perceptual, then the question becomes,
“What is perceived?”
Perhaps mystical drug experience opens the spiritual “door” or “eye” into a non-material realm. It is not necessary that a drug-triggered spiritual experience be by definition illusory and/or delusional. On the contrary, perhaps the triggered-brain, as a perceptual organ, actually does afford glimpses into the spiritual realm. If so, far from constituting a materialist, anti-mystical conclusion, drug-triggered spiritual states may in certain cases actually
confirm mystical claims.
Therefore, just because some drugs can instigate mystical states, there is no reason to denigrate the experience or to “protect” Catholic mysticism from it. To the contrary, it would tend to support the Church’s perennial claim that mystical union with God or the Spirit is a reality. Granted, this would oblige the Church to recognize some non-Catholic mystical experiences as valid - which, in a real sense, it already does: after all, “Natural Religion”, too, sometimes conveys God and grace even to non-Catholics and non-Christians, and mystical experience has always been a powerful conduit of experience to the Natural Man and Woman
