Things only got worse from there. By the time Noah comes along, not only is there no one calling on the Lord, but every thought of all the people was evil continually. You might think that if no one was calling on the Lord in Seth's day then they were all really wicked, but that is not necessarily true. It is true that they were not pleasing God, and not living right, but they were not yet completely depraved. For example: I had a neighbor who was an atheist, and some might assume he was a wicked man, but surprisingly he had better morals than many of the so-called 'Christians' in the town. He was married to his first wife and, as far as I know, had been faithful to her, he abided by the laws of the land, he was a good neighbor and involved citizen, he had raised his children and none of them were on drugs or in jail, as far as I know, when I did some work for him he paid a fair wage, etc. Those 'good' things could never make him right with God, but he shows that someone can, for a time at least, live without God in his life and yet maintain some integrity. It is possible for someone to not call on God as the people of Seth's generation and still not be to the point of the people of Noah's generation.
How it must have saddened and angered God as He watched these, His children, destroying their lives and the lives of their families and those around them. He finally decided that it would have been better if Man had never been created and was going to destroy them all. If it had not been for God's grace finding something worth keeping in Noah it would have been all over. Have you ever really thought about how close the human race came to extinction for the second time (the first was with Adam and Eve sinning). I remember a comedian that joked about telling his disobedient kids, "I could kill you and make another one to replace you." Well, God could have. He could have wiped out this universe and started over, but His love and desire to be loved kept Him from giving up. There will come a day when we as a race will cross the line He has drawn and it will be the end of this world, but because of that love He provided a plan for those that love Him to be with Him forever.
As a father, I love my children and want them to love me. I want to be with them and want them to want to be with me. I can't imagine the pain that some fathers have faced, are facing, will face as their children rebel and turn to hatred toward their fathers and don't want to be near them. In some cases I know that fathers have done dispicable things to their children and have brought it on themselves. I also know that some fathers have done the best they could, but Satan has stolen their children's hearts and minds just as he stole, and continues to steal, the hearts and minds of God's children. For those first fathers all I can say is repent, confess your sins, and try to make up for the pain you caused the ones that you should have loved and protected. The good news is that if you come to God He can and will forgive you, even if your children never do. To that second group of fathers I can only say that I cannot imagine the pain, sorrow, anger, doubt, confusion, hopelessness, helplessness, guilt, etc. that you experience. I hope and pray that I never do, but I am sure you never expected to either. There is another Father who knows and understands even better than you the agony of losing a child to the world and Satan. Go to Him and depend on Him, and, like Him, never give up hope that those erring ones will return. Remember the prodigal son and the joy of his return.