As each generation passed, men were moving farther and farther away from God, so that by the time of Noah and a bit more than 120 years before the Flood, Genesis 6:5 records that the wickedness of man was great on the earth, and every imagination of the thoughts of his heart was only evil continuously. It was so bad that God determined to bring a judgment down on billions existing in those days where every imagination of their thoughts of men were evil continuously. With an eye to continue moving His plan forward, He gave Noah the tools he needed by His grace to build the ark as God patiently continued to move His plan forward toward the promise of the merciful redemption He had given in the Garden.
This section of Genesis 6 has been the subject of much speculation over the years. But as Jesus Christ's own words tell us, angels were not created to have sexual relationships with men, even though we can see that it certainly seems to be clear from the biblical reference to angels that we see also in Job 1:6, 2:1, and 38:7 that these probably were angels, referred to as the sons of God.
But keep this in mind, God creates kind after kind. Angels cannot cross over that line even in disobedience to God. However, as men take themselves out from under God's protection by blatantly disobeying His laws, they put themselves at risk of demonic influence, even in some cases, demonic possession as we clearly see in the Gospels.
With this in mind here is a very clear and important warning we can glean from the scripture to be cautiously applied for us living in these last days. It is from Richard Ritenbaugh's sermon, The Days of Noah. Although given back in 2008, it is a look into today and what lies immediately ahead, because God is continuing to make sure that all men will ultimately understand that everything depends on Jesus Christ.
Brethren, it was Satan's demonic attitudes and methods that were driving men who had removed themselves far from God, that they left themselves wide open to having every thought they had to be evil continuously. It was the same demonic spirit that would eventually drive those Jesus Christ spoke to as recorded in John 8:43-47, to crucify Him, because they loved not the truth, to live it. Jesus Christ said:
It is the same demonic influence that will produce the end time Nephilim and society as in the days of Noah, so driven by the spirit of Satan and his demons that every imagination from the heart of men will be evil continuously. The only exception will be those who are faithfully learning and living the Word of God through Jesus Christ.
Now, we can read all that in two or three minutes, and because it takes such a short time and it is just words on a page, we tend to ignore or dismiss the time element in all of this. God appears to call Noah to his task 120 years before the Flood. I am just assuming that. It is disputed that God told him at that time. But let us just take it as written, that God said there is 120 years, Noah has found favor in My eyes, this is what you are going to do.
And so he did it, and waited and waited and waited. Noah had to act in faith to build the ark as efficiently as possible so that it would be ready when God sent the Flood. And if God did not tell him that it was 120 years, he had to be ready at any time.
Noah was an exceptionally faithful man. It says that at the end of chapter 6, he did everything as God commanded. And actually, it said it several times throughout this story. Chapter 7, verses 5, 9, 16, I think that was the last time. But it is mentioned at least four times in Noah's story that he did everything exactly as God commanded. And one of the things that he did perfectly was wait, wait with faith and righteousness. And when the Flood came, he was ready, the ark was ready, his family was ready.