Consider this though: The Spiritual/Religious perception of Reality has been shrinking, while the Scientific perception of Reality has been expanding.
It is possible that a Spiritual/Religious Reality exists, but it's probability now is a tiny fraction of what it used to be.
I'm back. What you're saying does indeed describe how religion has become more compartmentalized if not denigrated over time. But that wasn't the primary point I wanted to make. The bolded part in your quote of me wasn't drafted as artfully as it should have been.
What I really meant was that because human intellect is both finite and limited, it may never be possible to have a complete understanding of existence, reality, other universes or planes of reality, etc. That's not necessarily true but it's a possibility. If it is true however, and it is certainly true now, then you have to admit the possibility of supernatural, paranormal phenomena are real. It doesn't prove that they are, only that they can't rationally be excluded.
It may be that by taking psychotropics or engaging in years of daily meditation, extreme fasting or a host of other religious and mystical practices might, just might, open up other realms that are beyond our ability to perceive or understand w/o such interventions.
This is the true agnostic point of view. We recognize that an infinite variety deities, universes and even things we can't even begin to conceive of, can't rationally be dismissed as fiction or fairy tale. At the same time, they shouldn't necessarily be accepted as fact either. We genuinely have no preference either way and in the most extreme case, don't even recognize the question as valid.