If god flooded the earth and only Noah and his family was saved how did all other races come about?

Answer 1

All of the races on earth have come from Noah's sons Ham, Shem, and Japheth and their wives. Genetically, there is not a lot of difference between any race and all of the genetic differences arose over time from the original DNA of the three men and their wives.

Answer 2

AnswerWhat you have done here is ask a science question and seek a religious answer. The best way to explain this is to talk about Stephen Jay Gould's concept of Nonoverlapping Magisteria (NOMA). He said that the domain or magisterium for science is the empirical realm - what the universe is made from and why it works the way it does. He said that the magisterium of religion includes the ultimate meaning and moral values. These magisteria are nonoverlapping - science does not comment on the ultimate meaning of life, while religion should not comment on the natural world.

If you accept Gould's premise, then you will have less difficulty in understanding Noah's Flood as an allegory. In fact, black people were the first people on earth, over two hundred thousand years ago. Although many of us see the world today through the eyes of white people, whites were really latecomers on earth.