An argument against anything being supernatural:
Accepting “the universe is all there is” is why Science has been so successful.
If “the universe is all there is” is not so, where is the evidence? If there is
scientific evidence for something else, it automatically becomes part of
“the universe is all there is.”
Let me put this in different words.
If you say that there is a supernatural entity that can interact with the natural
(e.g. things and people), then it must effect the natural in some way that is personally observable and therefore measurable. Anything that can be sensed is something that can, potentially at least, be observed and therefore measured. This includes brain activity or any other activity that effects what we feel and sense. All that people say effects them supernaturally is not beyond the natural – it part of the natural.
To perceive this effect the supernatural must influence the natural just as
non-supernatural entities do. Therefore, in principle you should be able to
measure this effect. If you can measure this effect, then it is part of our universe
and is really part of “all that is”.
So you cannot and never will experience the supernatural because it cannot affect you.
Where is the evidence for the supernatural
— there is none!
Naturalism and Religious Experience 