I am not sure what your point is about trying to imagine something new and unknown tec...all the concepts that have been pointed to point to the fact that the spirit realm has been created in the minds of men because of natural events...there is a connection.
In fact..it all leads back ironically to your evidence that we cannot conceive of an idea outside the natural world. Hallucinations are natural....imaginary friends are natural...dreams are natural....imagination is natural....the idea that you cannot come up with a new idea proves nothing execpt that we are limitied by our experiences....and you are limited by your own imagination. Others may not be so limited. I know I am not overly creative....I would probably never have come up with an alien idea if left to my own imagination.
I didn't miss what your 'super' comment referred to....I just applied you reasoning to mine.
And I think the concept you are referring to could more rightly be called....superspiritual....not super supernatural.
Adding the word super does seem to automatically give it new meaning....what is superspritual? What is greater than God? Actually, that is not so hard to imagine when we consider some gnostics believed that Jehovah or God as we know him was only the offspring of a much greater god/entitiy. And sophia his mother. The concept is far larger than your very simplistic god...mabe this god is superspiritual or super supernatural.