Well it is plain to me that the reaces of mankind are one specie offshooting from a common ancestor. Where we went wrong in our the0rizing was the timeline. It is becomming clearer of recent that Homo sapiens has been around a lot longer than we once thought. By a factor of say .... 10 or so. Thus time is found for the wide diversification of the races we see today.
I believe as well it is no accident that the Story of Noah allows for one common ancestor. Just as it is no accident that the ancient Hebrew texts speak of the circles of heaven in the same epoch that Hindus believed the earth was balanced on the backs of four celestial elephants and thousands of years before the great thinkers of the West were sure the earth was flat.
I'm afraid that I, personally, put the story of Noah and those in the Upanishads in with Zacharia Sitchen's.
Real science will reveal the truth.
And whether we've been around for, say, 15,000,000 years or more...well, read Michael Cremo's books for that sort of theory. He's a Western Hindu who believes mankind has been around for 100,000,000 years, as the Hindu texts teach. His evidence is scant, but interesting.