Why use cryptic books subject to a variey of interpretation?
Only one book of scripture* is cryptic, dear MDK (peace to you!): the revelation given to John. Which was cryptic for a reason: it's a REVELATION. Meaning, it must be REVEALED. By the One who so encrypted it... and no other. None of the others, however, were cryptic, but actually very open and revealing. Now, than man tampered with, altered, edited, mistranslated, mistransliterated, and misinterprets it... well, that's on man who does so. Not on the One who inspired it.
Why use charismatic individuals with stories of their supernatural calling?
Two things here, dear one:
1. The only person you could be referring to is Christ. None before him had anything "supernatural" set before them, in the manner you are insinuating. He, though, didn't have such a CALLING - he already WAS such a being. He simply took OUR form... so that he could pay the price for OUR sins.
2. That word, "supernatural"... is a man-made word. Meaning, in essencem a "nature" that is "superior". And so, this would be true of my Lord: HIS nature far, far exceeds that of ours. Love... is his overarching nature. Hate... is ours. And so ours is largely debased... and thus [quite] inferior. However, "supernatural" has nothing to do with "spiritual", vs. "physical", as you suggest and may believe. Or "celestial" vs. "terrestrial." While man's current "nature" is physical/terrestrial... it won't always be. It is NOW, simply because of the vessel that he inhabits. His TRUE nature, however, IS spiritual... celestial. Just a "super" as ALL spirit beings. The "calling", then, isn't to become a "supernatural" being - that is the RE-calling: to RETURN... to the "superior" nature. The calling... is to be a king and priest... which "superior" nature one must possess in order to fill such a role.
Being charismatic has nothing to do with any of this. That is just a word people use for those who are somewhat persuasive with their words. Christ, however, wasn't persuasive solely due to his words: his acts showed who he was and was the impetus for many that followed him to do so. He put his money where his mouth was: he walked... the talk. Unlike most charismatics: they tend to put OTHERS' money... where THEIR mouths are.
I hope this helps and, again, I bid you peace!
A slave of Christ,