We can prove that we have a variety of different beliefs in society all leaning towards the belief of another realm or existence.
B'ah. There was me spoiling for a fight and you have to go and be all reasonable about it.
Humans do have a tendency to explain part of their experience in terms of the non physical, don't they?
Gives me the right ump!
My take on it is that humans have a predisposition to infer intent in objects or occurrence. So, when a door stubs our toe we think 'bastard door!' or if it rains we think 'the weather hates me!'. (Even that sentence implies intent on behalf of the door).
As a kid I used to imbue my teddy bears with personality (I even talked for them as well as to them). I found it very easy to view them as a personality.
I forget where I read it but and experiment I recall from my undergrad days where kids where shown a cartoon of two circles bouncing around at random on a screen, one circle was larger than the other and the kids concluded that the bigger circle was 'bullying' the smaller one.
I conclude from this that they were ascribing a intent to the circle.
As we grow up we are logically aware that objects don't have personalities but we find it hard to shake the notion and this comes out in our belief in a non material component of the world.
As an aside when people start using 'energy' as in the context of spirituality I die a little inside.