There are a number of suggested theories for the identity of the sons of God, which include evil angels using the bodies of ungodly men, and power-hungry despots.
The answer to your question is in the book of Genesis Chapter 6 "sons of God and the giants of old" Do some research on this chapter and verse in the Bible and you will find the answer your looking for
Genesis chapter 6:6
Chapter 6 is about the great multiplication of sin which necessitated the Flood. God's provision and preservation of the righteous is also prominent.
Genesis chapter 6 discusses the increase of sin on Earth, God's decision to bring a flood to cleanse the world, and Noah's righteousness, who God chose to save along with his family and pairs of animals by building an ark. The chapter also mentions the nephilim, who are believed to be a group of giants or fallen angels.
Genesis 6:1 refers to the union of "the sons of God" and "the daughters of men," resulting in the birth of the Nephilim. The interpretation of this verse varies among theologians. Some believe that the "sons of God" were angels who procreated with human women, while others suggest they were men from the godly line of Seth. Regardless, the verse is generally understood as depicting a period of moral corruption and divine judgment that led to the flood in the subsequent verses.
The names of Noahs three (3) sons were: Shem, Ham, and Japheth. Moses records this fact in the book of Genesis in several places, see chapter 5 verse 32, chapter 6 verse 10, and chapter 7 verse 13.
that God was sorry he created man because his heart and intent was toward evil.
God created the earth in 6 days out of nothing! and you can find the whole story in Genesis Chapter 1 ... (in the bible)
Genesis 6:9-10 This is the account of Noah and his descendants. Noah had God's approval and was a man of integrity among the people of his time. He walked with God. He had three sons: Shem, Ham, and Japheth.
The nephilim were created when the sons of God (angels) had sex with the daughters of men. The story can be found in Genesis 6:1-4.
Genesis Chapter 6
Genesis 6:9 tells the genealogy of Noah. Genesis 9:7 is the order from God to "be fruitful and multiply". Genesis chapters 7 and 8 tell the story of the Flood. Essentially, Genesis 6:9 through 9:7 tells the story of Noah and the Flood.