Daring Wickedness due to Racial Mixing Before Flood

"The corruption of mankind reached its highest point when even the difference between the Sethites and the Cainites became obliterated by intermarriages between the two parties, and that from sensual motives....This means more than the total corruption of our nature, as we should now describe it, and refers to the universal prevalence of open, daring sin, and rebellion against God, brought about when the separation between the Sethites (children of Seth) and the Cainites (children of Cain) ceased. With the exception of Noah there was none in that generation "to call upon the name of Jehovah." "In those days there were 'giants' (in Hebrew: Nephilim (Sons of God) in the earth . . . . the same were the mighty men (or heroes) which were of old, the men of renown."... With the virtual extinction of the Sethite (true) faith and worship no further hope remained, and that generation required to be wholly swept away in judgment."  A. Edersheim; The Universal Corruption of Man--Preparation for the Flood