It seems clear that there is a shared human mystical experience of "God" - meaning some type of otherworldy experience. If you look at famous descriptions of this, the visions of the Old Testament prophets, Muhammad's revelation, Buddha's enlightenment, they all seem to share common characteristics, including the one where this experience cannot be described in human language. This is why Isaiah and Ezekiel, etc, all use these bizarre metaphors, yet at the same time constantly reminding us that these are just their best attempts to describe something indescribable. It is not clear whether this shared experience is actually a reality, or whether it is some kind of shared neuro-psychological phenomenon.
What is clear to me is that any type of logical or theological reasoning about anything beyond this shared experience is pointless and clearly speculative and baseless.
So, I am not sure where this leaves us. I guess the most promising path would be to pour in lots of money into neuro-theological research.