Believer
"This 6th sense is how we perceive spiritual things. The 5 senses are objective and can be authenticated in a way that others readily accept, i.e., they can taste, touch, see, hear, smell it too. But the 6th sense is subjective. It is a personal understanding or epiphany or revelation."
The 5 primary senses are all of them fallible and can easily deceive the mind. The '6th sense', however, is notoriously inaccurate and misleading. How can you distinguish, with any certainty, the difference between a supposed revelation, from a very convincing psychotic delusion, when the conviction for both is the same?
Believer
"One person cannot prove their personal spiritual revelations to another. He may be able to articulate it, but authenticating it can only occur if the other person is also able to perceive it through their 6th sense. But a spiritual revelation is just as real to a person who uses that sense as are the things perceived with the animal senses"
So if someone has an experience that feels real to them, does it prove that it is real?
Believer
" if Satan wrote the bible, that would be proof that God and other supernatural beings exist. Right?"
Not at all. That's an assumption based on the 6th sense. What's stopping Satan from inventing fictitious characters for his story book, like George Lucas inventing Darth Vader?