Not everything that is natural is good. We see that in natural remedies and natural food. And we especially see it in humans.
The Bible refers to natural human tendencies as carnal tendencies. Human nature is often called “the flesh” (except in a few translations which try to explain what “flesh” means) Following the flesh leads to death; following the Spirit of God leads to life.
There are lots of natural things in all of us that we recognize as bad: anger, jealousy, lust, pride. Galatians 5 has a nice list of them. Then it lists things that are produced by the Spirit: “love, joy, peace, patience, kindness, goodness, faithfulness, gentleness and self-control.” (Galatians 5:22–23)
To say “that’s just the way I am” is not a good excuse; it’s merely an admission that you need to be transformed by God’s Spirit!
Rather than putting a stamp of approval on natural, let’s call ourselves and others to a higher goal: Spiritual.