Simple. I've researched this for years. NDE's are the real deal; they have zip to do with "oxygen deprivation", the absolute lamest attempt at pseudo-science I have come across in some time.
For those who simply refuse to believe that there is a spiritual realm.....that demons exist, that angels exist, etc.....simply because they can't see them (I know several people who have......and they're far saner than many here)will just sit back, guffaw, spout sarcasm, and call these people quacks, idiots, charlatans, or worse.
...and they're wrong.
I will not go into my own personal experiences here, and I DAMNED well guarantee I'm as sane as anyone. Suffice it to say that those who pooh-pooh the concept of life after death....and the existence of evil....are gambling with something they don't want to gamble with.
It's hard not to get a feeling of superiority when reading some of the posters here. I know it's wrong and a character flaw, but once you have actually experienced consciousness outside the body or been confronted with the undeniable existence of an afterlife, people who deny it seem so thoughtfully primitive. I shouldn't worry about their souls, but sometimes it is frustrating not to confront ignorance. If everybody made a conscious effort to develop their mental abilities while here on earth, it would be a muuuch better place.
ABSOLUTELY CORRECT AND WELL SAID.