If a born blind man is stubborn and skeptical, and does not want to believe your words or experiments...there is nothing you can do to convince him that there is such a thing as Light that is in fact falling on his body at that very moment....and forms a fundamental feature of life on earth.
Which doesn't change the fact of light. We don't deduce that light is real because some people believe it, or even because some people have working eyes and others don't, but because it behaves consistently regardless of who observes it or how.
My point is very simple. Merely the absence of one single faculty can make us completely cut off from a very fundamental and crucial aspect of life such as Light, to such an extent, that we can exist life long with no awareness of it what so ever. And no experiments or instruments can convince us of its existence unless we want to believe in it.....and nor can we actually know what it really is through these indirect methods.
Equally, though, some people believing that they have a special perception that's completely unreplicatable by independent means, undetectable by machinery, and has no detectable influence on the measurable elements of reality that have been validated doesn't make that special perception right.
Only a direct experience through 'sight' can give us that.
And yet an enormous number of people are willing to accept microwaves, radio waves, gravity, Higgs Bosons, electrons and the existence of the Kuiper belt.
Awareness of certain unseen aspects of life that we call 'spiritual', are similar.
No, it could be similar, but you'd still need something more than unsubstantiated (and contradictory) claims of people to support the idea.
For many people spiritual forces and influences are as natural and as pervasive as light is to all of us....however skeptical others may be of them.
And, once upon a time, so were magic, aether, humours...
O.