Actually..."Faith comes by hearing, and hearing by the word of God" Romans 10:17. Which means that many "believe" by "faith" after "hearing" from those who have heard from God, or after "hearing" from God directly. And this is not speculation or conjecture on my part, but from being one who has heard directly from God.
So, then, our "faith" is not founded on "belief", but on actual contact with God, and therefore, by "knowing."
By your own description, it is due to being in contact with other humans and with books written by humans.
You haven't presented a single thing that would distinguish your spiritual world with one that doesn't exist. You claim that science can't detect the spiritual world, but that is also true of made up fantasies.
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