In Zen and the Art of Motyorcycle Maintenance, the author maintains that gravity didn't exist before Newton discovered it!
So ultimately, it all boil downs to BELIEF.
If you believe in paranormal, ghost, ESP, Near Death Experiences, God, after life: then they exist?
If you don't, then they don't.
Reality is subjective.
There are two kinds of people in the world. One who likes food; and, the other, who don't.