Kevin Barney declares it isn't "natural" to keep commandments.

Of course, it isn't.  That's why the "natural man" (or woman) doesn't keep the commandments.  Of course, Kevin seems okay with that. 

Well, Kevin & co., continue to be "natural" and insist on "naturalness."  The Book of Mormon is quite clear on where the "natural" person's final destination will be.  (hint: it's not the presence of God).