HMTM: To be unable to see the unseen does not itself prove that the unseen is a delusion.
That's true enough.
But there's certainly enough other evidence to prove that believing the majority of what is in the Bible is to believe in a delusion.
de·lu·sion
dəˈlo͞oZHən/
noun: delusion; plural noun: delusionsan idiosyncratic belief or impression that is firmly maintained despite being contradicted by what is generally accepted as reality or rational argument, typically a symptom of mental disorder.