I think you're confusing
Evolution: The Theory with
Evolution: The Metaphor, as well as potentially
Evolution: The Historical Account. (Next up:
Evolution: The Movie! And possibly
Evolution: The Flamethrower! The kids love that one.)
Evolution the theory is indeed a product of human thought. It says nothing in particular about the human body other than some explanations for its morphological function and similarity to other mammals. It's a construction of human endeavor to explain evidence left over from the historical account (the real process of whatever happened long ago).
Evolution the metaphor for change and progress is simply a word people use when a new thing is better than an old thing.
It sounds like you don't really know what evolutionary theory has to say and you're just reacting to it's use as a word in common english.
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