Both pantheism and panentheism imply set theory. You can see that well in Post #2 from John. They are ways of organizing and ordering the world (the information).
Mysticism, to me as idealist, is the step beyond the set theory. It begins with the recognition that, "The information 'seen' is the information 'seeing'," describes reality (is seen).
I'm afraid I don't quite understand the 2nd post It doesn't exactly explain how creation and God can be both the same and different at the same time
You spoke about objective reason, I think you were talking about what I would call axioms, the statements whose truth we cannot deny. Would that be correct?
Yes, and I actually prefer that term better, I did feel uncomfortable saying "objective" because of my complex views on objective vs subjective reality which is an entirely different subject