ID should not be taught as Science. However, there should be an area of scientific research dedicated to it in trying to figure out if the spirit exists.
There is, its called theology.
Since such a large percentage of people believe in a spirit and even a great spirit (god), ongoing and serious research into this field is more than justified.
The field already exists, its called theology.
there are many scientific (used in the strict sense of the word) studies that show there is something metaphysical in the human mind
And there are equally as many studies that show the opposite, that what is happening in the human mind is just a neurological process...nothing meta about it.
Further, there are many accounts of "normal" people reporting extraordinary spiritual experiences. Is it safe to dismiss all of them as delusional?
Only when they start to claim specifics i.e. "I had a spiritual experience, I know it to be Jesus". The problem is not the experience, the problem is whats invoked to be spiritual(Allah, Jesus, Buddah etc...). Anytime an experience is had the person claims to know which God it was that enlightened them. However, it is usually the God they already know based on where they live or have information about. If its in Iraq its Allah, if its in Japan its Buddah, if its in India its Brahman, if its in the US its Jesus etc...Why? This seems delusional...
Research needs to be conducted and the results must not be silenced by other scientists who can't fit the findings into their current understanding.