Genesis 6 begins with a world that is growing. The number of people is increasing. But something else is increasing as well. Sin.
As we saw in Genesis 5 the culmination and end result of sin is death. We were reminded again and again of sins consequences with the words “And he died” person after person, generation after generation died. Death had entered God's good creation because of sin.
When we come to Genesis 6, we discover that the problem isn't simply that people die. The deeper problem is what is happening inside the human heart.