The only biblical thing about this movie is the names of the characters! The watchers were fallen angels or demons that came to earth and had their way with the beautiful daughters of mankind and half human half angels were born and many believe they were Nephilim or giants.
Noah wasn't out to kill babies there were no angelic rock monsters that took pity on mankind because God was being mean to humanity the sons of God or the watchers came to earth and raped human women because how would you stop them?
The world became filled with people who were murdering each other and Giants who were the son's of angels who eventually started eating people and nobody except Noah and his family believed in God anymore and it had never rained before because in those days mist would come up from the ground in the morning and water the plants and there were precious gems in the rivers they were as common as ordinary rocks and people worshiped gods they created and idols and they worshiped the fallen angels.
The whole world became corrupted and it rained until the water was 22 cubits above the highest peak and it says the floodgates of heaven opened it definitely wasn't just rain and we have found the fossils of fish on the peaks of the highest mountains and there are ancient cities on the ocean floor but people refuse to see the truth of the Bible. Science can only tell you how something works but it can't explain why it works if anyone even reads this watch some videos on YouTube about John Lennox and fine tuning.
Jesus loves you and wants to work in your life.
We all fall short of the perfection needed to be accepted into heaven and Jesus became the perfect sacrifice to save a dead and dying world There is not one person who can claim to be good as God the father is good because we all sin and fall short of the glory of God there is no relative goodness that can save us because we have all lied we have all taken the name of God in vain and used it as a negative phrase. We have all disobeyed our parents and have fought with them All sin will equally drag us into hell as long as we refuse to admit that we need the perfect grace of God and Jesus and the Holy Spirit.