Why did God say the end of all flesh had come before Him in Genesis 6?
God declared the end of all flesh had come before Him because the earth was corrupt and filled with violence. All flesh had corrupted its way upon the earth, so God said He would destroy them with the earth, the judgment that led up to the Noah flood.
Les explains that in Genesis 6, God's verdict was based on what He saw: the earth was corrupt before God and filled with violence. All flesh had corrupted his way on the earth, so God said the end of all flesh had come before Him because the earth was filled with violence, and He would destroy them with the earth. Les ties this to the buildup to the Noah flood and says it foreshadows a similar judgment: when God will pour out His wrath and vexation on Christ-rejecting man in the final seven years of tribulation. He also points to Romans 3, where Paul lists the deeds of the ungodly - the whole human race outside salvation has gone out of the way, become unprofitable to God, and none does good. This worldwide wickedness is not limited to America or the western hemisphere.
The earth also was corrupt before God, and the earth was filled with violence.
And God looked upon the earth, and, behold, it was corrupt; for all flesh had corrupted his way upon the earth.
And God said unto Noah, The end of all flesh is come before me; for the earth is filled with violence through them; and, behold, I will destroy them with the earth.