"the natural man is an enemy to God, and has been from the Fall of Adam." Smith, Joseph. Book of Mormon, Mosiah 3:19.
I never stopped comprehending all the "spiritual things" they claim separates them from me. If anything, I now comprehend MORE than they do, because I'm willing to look at things from more than one direction to see if they have any three-dimensionality to them.
The categorization of others through the use of this term is merely a tool for distinguishing themselves and creating a false wall that supports their pretense of moral superiority.
Besides, living as a Natural Man is a lot more fun: no more pray, pay, and obey for me.