Well, it's certainly hard to define. Just as any grocery store can slap an "all-natural" label on nearly any product, so too can we.
But my point here is more that we are not consciously-created products, at least not yet. For now, we're still the results of a "natural" evolutionary process.
The first definition of natural returned when I google the word is
> existing in or derived from nature; not made or caused by humankind.
So when you are trying to say that what is caused by humans is natural too, then you are clearly contradicting the dictionary definition of the word. Which is what I was trying to draw your attention to when I asked the question.
But my point here is more that we are not consciously-created products, at least not yet. For now, we're still the results of a "natural" evolutionary process.