I don't think it's even an idea so much as a basic human need/instinct. There's a reason why no human society in history ever has developed without a spiritual element. Indeed, I would go so far as to say that, as a species, we naturally, unconsciously believe in God (or some variation thereof), but have to work to use our rational mind to consciously suppress that belief.
You conflate spirituality with God, but the two need not have anything to do with each other whatsoever.
So when you say "or some variation thereof" what you actually mean is something entirely different to God (specifically, an acceptance that there is much about the world - and in particular human consciousness - that we do not yet understand). There is no reason at all - other than intellectual laziness - for this ignorance to manifest in a belief in God.
But 'supernatural' can also encompass matters that are spiritual. This need not have anything to do with God, which is why I objected to you conflating the two.
What you actually mean is "Anyone who has opened their mind for more than 5 minutes will be aware that there's loads we don't yet know or understand about the world - and will be open to the possibility of transcendental potential (for want of a better phrase)".
Fúck all to do with God.
Last edited by Monty92; 12-05-2017 at 11:59 AM.