Just to be clear  that you are stating that the theory of evolution by natural selection as formulated by Charles Darwin is "not really about evolution at all"? That is the topic sentence of the third paragraph and so I want to make certain that I understand your assertion. If I understand you correctly, then I have to say that I disagree with your assertion that Charles Darwin's theory of evolution by means of natural selection has is not about evolution. I think you will have a tough go with that argument.