I can't possibly agree to this no matter how you define "natural". There is a vast amount of reality we don't comprehend and it could all be supernatural or even just other. Without a definition for consciousness we don't know that even it isn't some aspect of God or engineered by supernatural forces. You have convinced yourself you know everything through science which allow everyone to see beyond perception right into all of reality.
You simply turn a blind eye to the fact that every event is impossible. Every single combination of a trillion coin flips is equally likely including all heads or all tails. You only see what you believe and you don't believe in God or anomalies. You don't believe in order or disorder. You believe in a mechanical universe where everything is not only predictable but preordained. And these beliefs for the main part make free will and consciousness impossible so there is no need for definitions.
The easiest approach to see where naturalism ends, is by looking at our five senses. The human five senses evolved naturally. If this was all we had, and there were no science tools, we could not prove 1% of modern science naturalism. That modern proof requires tools that enhance our senses beyond the natural; microscope and telescope.
However, these tools too not form naturally. Microscopes do not grow on trees inside giant pods. Without those tools you cannot see cells or DNA, and the theory of evolution would be have to be different. You would not be able to do carbon dating to prove any fossil age. All the tool needed, do not form naturally. They all required human consciousness, can to detach from natural forces, to make the tools, since the tools cannot form naturally, no matter how long you wait.
Tools are manmade things that would not appear naturally through any sequence of natural forces. They start in the brain, more like a new rearrangement of information, that is not exactly material in nature. This stage is often ridiculed. If man was meant to fly he would already have wings. The development effort attempts to turn this information into a material form, even if not natural. This unnatural tool, enhances our senses, so we see even more detail within natural reality and extend its known frontiers.
Many animals have stronger senses that humans; eagle eyes. Conceptually, the eagle can see data human eyes cannot see. Yet, they do not do eagle science. Rather their eyes evolved within material reality, to help them remain, within material reality, based on the added sensory limits. They do not have that extra something, that makes tools, that could never naturally form.
All we need to so, is look when innovation took off; rise of civilization, That is where materialism sprouted a new parallel branch, this detaches and roots on its own, to form a second tree; ego or divine soul, with will and choice beyond just materialism; creation of tools.