But since these angels are watchers or witnesses who report to GOD, at one point in their service they couldn't resist the fair daughters of men.
That's why their offsprings were like superhumans compared to a normal carnal man on earth.
Angels of God; ALL of them have been made ministering spirits sent to minister to heirs of salvation! They do not desire to have immoral sexual relationships with beautiful women! Human beings began to multiply, giving birth to daughters. If the sons of God are fallen angels, why was God grieved seeing the wickedness of humans, whose every thought and imagination of his heart is continually evil?
Genesis 6:1 (KJV) And it came to pass, when men began to multiply on the face of the earth, and daughters were born unto them,
Genesis 6:2 (KJV) That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose.
Genesis 6:5 (KJV) And GOD saw that the wickedness of man (human beings) was great in the earth, and that every imagination of the thoughts of his heart was only evil continually.
I have to wonder if you have perhaps been influenced by the non-canonical writings from the books of Enoch?