In other words; There are more than one view of this.
The presence of more than one view shouldn't confuse you. There is more than one view of nearly everything. That does not mean that all views are right. Zen is no more in the Western philosophical tradition than Aristotle, Descartes, and Wittgenstein were Zen practitioners.
What about the concept of "Buddha nature" that permeates all of existence? I am aware that not all Buddhists see it as "supernatural", but if it is not a part of observable reality then its claim is as unsubstantiated as that of a god or gods, which means that it fits nicely into the category I described.
In the first place, aren't you now arguing something different than you were a moment ago? Namely, you began by arguing that all religions asserted there were unobservable realities. Now you seem to be arguing that Buddhism asserts supernatural realities. Those two things are perhaps easily confused but they are not the same. So which are you asserting? One, the other, or both?