In our culture, we love the word "natural." Put that on any packaged good, and go with some type of green color scheme, and people like me will buy it. (Sister Michelle here.)
We want things "created by nature" not humans, and we Christians often equate that with "created by God." So, natural is good.
Originally, it was good. Remember all the things that God called "good" while He was creating the world? He even called humans "very good." So…what happened? Today's Good word says that the natural man is an enemy to God. How did "natural" all of a sudden become sinful?