Why did God flooded the world? He said it twice; before the flood and after the flood as to why He did it. He said this in bold before the flood. Genesis 6:5 And God saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually. 6 And it repented the Lord that he had made man on the earth, and it grieved him at his heart. 7 And the Lord said, I will destroy man whom I have created from the face of the earth; both man, and beast, and the creeping thing, and the fowls of the air; for it repenteth me that I have made them. 8 But Noah found grace in the eyes of the Lord. He said this in bold after the flood. Genesis 8:18 And Noah went forth, and his sons, and his wife, and his sons' wives with him: 19 Every beast, every creeping thing, and every fowl, and whatsoever creepeth upon the earth, after their kinds, went forth out of the ark. 20 And Noah builded an altar unto the Lord; and took of every clean beast, and of every clean fowl, and offered burnt offerings on the altar. 21 And the Lord smelled a sweet savour; and the Lord said in his heart, I will not again curse the ground any more for man's sake; for the imagination of man's heart is evil from his youth; neither will I again smite any more every thing living, as I have done. 22 While the earth remaineth, seedtime and harvest, and cold and heat, and summer and winter, and day and night shall not cease. It had nothing to do with "fallen angels" mixing it up with the daughters of men. Why? Matthew 19: 4 And he answered and said unto them, Have ye not read, that he which made them at the beginning made them male and female, 5 And said, For this cause shall a man leave father and mother, and shall cleave to his wife: and they twain shall be one flesh? 6 Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder. God joins the man and the woman in holy matrimony. God is not going to join a man to a man or a woman to a woman or a man to a beast or a woman to a beast. So God is definitely NOT going to join a fallen angel or even an angel to a woman. Matthew 22:30 For in the resurrection they neither marry, nor are given in marriage, but are as the angels of God in heaven. The sons of God are Israel roots in the Bible as in referencing the family tree back to Seth and then to Adam as the sons of God. Luke 3:38 Which was the son of Enos, which was the son of Seth, which was the son of Adam, which was the son of God. Who are the sons of God now? It is not by blood nor the will of man any more. John 1: 12 But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name: 13 Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God. The sons of God were never angels in the Bible, let alone, fallen angels. How can fallen angels still be referenced as the sons of God? They can't be. Therefore, they never were.