Big if true (probably is)
(media.scored.co)
Nah, all humans are descended from Adam and Eve, it skips a few generations from when they were kicked out of the Garden to when Cain killed Abel, and God permitted a certain degree of incest so humanity wouldnt completely die off. So the other people around are also descendants of Adam and Eve, and Cain eventually went on to produce his own race apart from Adam's line that was evil and quickly degenerated into devil worship. Seth's (Adam's son who replaced Abel) line were called "Sons of God" for their piety, while Abel's spawn were called "Daughters of Men" for their wickedness and base nature. It was the intermingling of these two races and the profanation of the worship of God by uniting it to the worship of devils that led to God flooding the earth.