In Genesis chapter 6, Satan is again working to prevent God's purpose.

.............He causes the line of Cain to marry into the righteous line.

.............................This corrupts the line in which the Redeemer will come to the extent that only Noah is left in the worship of the Covenant of God.

................................Genesis 6:5
"And Jehovah saw that the wickedness of man was great in the earth, and that every imagination of the heart was evil continually."