The bible does not teach a "young earth". The earth is not 6,000 years old nowhere in the bible does it say this, the scientific evidence shows us the earth is much older than that. Modern day scientific age of the earth is not in contradiction with the bible.

The bible can trace the first man called "Adam" to around 6,000 years ago, you are correct here, Adam gave birth to the adamic race.

Biologically and scientifically speaking, how is it possible for the pure-blooded black, asian, and white races to have descended from Adam and Eve, Noah and his wife, or any other common ancestor? Could Adam and Eve reproduce and have black, white, and asian children? Of course not. That's biologically impossible.

The black, white, and asian races -- in their pure-blooded states, absent any mixing among the races -- are of completely different lineage. They were created separately, and are essentially different species of "humans." The fact that separate races can interbreed (and produce hybrid species) is not proof of common origin or common species, as this phenomenon exists among other animals -- eg, lion and tiger can mate and produce a hybrid "liger", horse and donkey to produce mule, etc.

The Bible -- when translated and interpreted correctly-- confirms the fact that Adam was not the first "human." There were other people on the earth before Adam was created. That is why Cain feared other people would kill him after he was banished, and how Cain was able to find a wife, have his own descendants, and build a city after being banished from Adam & Eve and their descendants.