Re-read Genesis. Dividing up by language is a punishment for disobeying God by building the Tower of Babel. That narrowed the gene pool within these groups leading to them sharing similar physical characteristics. The term “race” is very Darwinian, suggesting that people with higher levels of melanin in their skin are less evolved from the ape than those with less melanin.
We are all of the same race: the human race.
We all share the same skin color: melanin, just in differing amounts.
Just because someone from Japan has more fatty tissue around their eye doesn't inherently make them more “mathematical” than one without the higher level of fat around their eyes.
I may be a little stereotypical, however the common fruits of “ethnic” groups is hard to deny over time. What draws us to travel the world outside our own neighborhood? Rich new experiences hosted by very different people groups that have different gifts to give the world.
God made us different, but it is Christ that binds us. People who don't share my race, but have given their hearts to Christ, are my brothers.