I think of the Eleusinian Mysteries and the ingestion of ergot. Those congregations had religious visions, but they were not of Christ, they were of Kore, without the vision of whom they believed they would not have salvation. Psychedelics then, must be non-denominational. The other worlds into which they poke holes and provide passage are not a singular heaven, but Olympos, Asgard, Nirvana, and many others as well. It must depend on the gods to whom the worship is given; to whom the supplication is made. I seriously doubt any initiate at Eleusis ever had a spontaneous vision of Jesus while the great drama played out.
It begs the questions: What would one see if she or he sought no god in particular? What would one see if she or he merely sought, “Hey you. Yeah you. Answer me. I know you’re there. I can see you through the peephole.” What deities or entities lurk closest to the widened pinpricks in the firmament created by psychedelic rapture? Would they be benevolent or malevolent? Who would be brave enough to test it?
In response to:
(speaking of North American Peyotists) “Sometimes (according to the reports collected by Dr. Slotkin) they see visions, which may be of Christ Himself. Sometimes they hear the voice of the Great Spirit. Sometimes they become aware of the presence of God and of those personal shortcomings which must be corrected if they are to do His will.” -Aldous Huxley, The Doors of Perception