Because it brings peace,light,love,power,freedom all that is contrary to a state of delusion which brings confusion, darkness,anger, misery and bondage.
You have an issue with spirituality but have not even set foot on the path.
So the feelings it evokes are evidence of it's authenticity? A line of cocaine would evoke similar feelings, MDMA can do it as well. Can a psychopath experience this enlightenment despite being void of emotions, empathy etc? if not, then it's simply another brain process.
How do you know I haven't, I have experimented pretty intensely with hallucinogens, meditate and constantly engage in existential rumination's. I don't trust my senses, I have experienced the oneness (this is because an area in the brain shuts off, which controls where you vs outside begins, real data) the fact that we are nothingness headed back to oblivion, I listen to alan watts etc. no one knows, he is just giving his best guess he could be terrible wrong and this is all a cruel joke. Emotionally satisfying ideologies do not move me as much as intellectually satisfying ones.
I have gone from spinoza's pantheism, to atheism, to a amalgam of buddhist philosophy only to find other humans telling me things that they can't possibly know.
to me it is intriguing to think why anything exists at all, aquinas said the reason was what exists must, it's very essence is to exist such that nothingness is eternally absent. If god exists I would imagine he is simply existence, with no control but simply a divided whole, to see infinity you must be zero, we are nothing, because infinity is nothingness, nothing is everything.