Surely it’s theists who attach undue importance to it, more specifically those who believe it is the metaphysical third eye, or those who agree with Descartes that it is the seat of the soul.
As far as I know it’s just part of the endocrine system responsible (along with other parts) for regulating sleep patterns. So long as your sleep/wake cycle is normal your pineal gland is working properly.
Jes the pineal gland (from the word pine as in pine cone because it’s shaped like a pine cone) is a gland in the brain (attached to the brain stem) that is responsible for regulating your sleep patterns.
I have my pineal gland examined every night when I dream. If your pineal gland stops working, you stop dreaming and eventually go crazy and die. Boy christians are dumb. Here’s some homework for you christian, go get some DMT ( what the pineal gland produces) and take it, maybe you can meet your sky daddy. Don’t worry, even though you will be under the influence of the most powerful hallucinogenic substance known to man., everything you see will be real.