In return I am curious about whether or not you share Lewontin's perspective that there is genetic divergence between human populations but probably nothing significant that can be attributed to natural selection to adapt to environment, including skin color.
I think skin colour can partially be attributed to natural selection, although I'm sure sexual selection also plays a major role, as do founder effects. Incidentally, it doesn't particularly well coincide with the classical "races" - some "Caucasian" (Southern) Indians or "Mongoloid"/"Amerindian" natives of the tropics in the Western hemisphere have darker skin than many sub-Saharan Africans.
There are other clear cases of adaptations (lactase persistence or heterozygosity for the sickle cell trait, for example). None of those that have been identified pattern with "races". I don't see why we should expect them to do so either: Environments vary at scales much smaller than continents. Evolution happens, oftentimes much faster than we realise. That is not an argument why "Blacks" (or "Africans"), "Caucasians", or "Asians" should be meaningful biological categories that can inform us about traits other than the superficial ones we used to identify them in the first place.