The OP is, just from the excerpt posted, unmitigated claptrap. There are observable, repeatable genetic differences between the various “races” of humans on earth. While there has been a significant blurring of the borders between those races, particularly in the last century, the differences still remain. No “race gene”? So, how prevalent is sickle-cell anemia in the “White” population? Why is there such a notable physical difference between whites/blacks/asians (not just color, but also body proportion, musculature, bone structure)? At what point does environmental adaptation become differentiation?
“So, how prevalent is sickle-cell anemia in the “White” population?”
Sickle cell anemia is a good example.
It is not universal among black Africans and is found in Asians.
It comes from proximity to malarial Mosquitos and incidences of malaria.
Sickle cell can protect against malaria but two copies of the gene causes the anemia.