Sons of God is used many times in scripture to refer to men (not angels) such as Genesis 5:1, 2 and Luke 3:38 calling Adam the son of God. Adam was the first son followed by Seth and then his son Enos and the family began to call on God, Genesis 4:26. These are the first sons of God mentioned in Genesis 6. Sons of God have always been followers, believers and worshippers of God. Man was created in the image of God in His likeness for the purpose of having dominion over the earth and to multiply the earth as male and female created he them, Genesis 1:26-28. Nowhere does it say that angels were involved with multiplying or having any dominion over the earth as Matthew 22:30 and Mark 12:25 makes it clear that angels do not marry nor are given in marriage so in fact they also can not procreate.
Sons of God in Job 1:6 and Job 2:1 can not be angels in these verses especially when Satan who is an angel just as the other fallen angels that were cast out of Gods heaven and are in everlasting chains (not literal chains) under darkness unto the judgment of the great day, Jude 1:6, but Satan has not yet been thrown out of heaven and does travel between earth and heaven accusing the brethren before the Lord. Under darkness means hid from the face of God as never able to approach Him as they were cast down to earth and have no more access to Gods heavenly realm. Read Hebrews 1:5-8; Psalms 104:4, God never called any of His angel’s sons. Jesus is Gods only begotten son and the angels were ministering spirits. We who believe and are followers of God are brothers and sisters with Christ and sons and daughters of God. Satan believes in God, but is not a follower or worshiper of Him. The phrase sons of God is used four times in the OT and seven times in the New Testament. Every time sons of God is used it describes followers, believers and worshipers of God. (Genesis 6:2, 4; Job 1:6; Job 38:7; Hosea 1:10; John 1:12; Romans 8:14, 8:19 Gal 4:6; I John 3:12)
Those sons of God in Job 1:6; 2:1 that presented themselves before the Lord are followers of God just as Moses followed and worshipped God and was called of God to present himself before Him on mount Sinai, Exodus 34:2. Read Job 1:6 again. It says Satan came also among them when they went to present themselves before the Lord. This means Satan was there like he is with all of Gods children to try and buffet them. If you go back to vs. 5 you read that it was Job who sent his sons (sons of God) to go and be in the presence of the Lord that God would sanctify them. Satan, being a spirit that Job's sons could not see came amongt them as a buffer trying to interfere with God sanctifying them. When God asked Satan where he came from he said from going to and fro in the earth and from walking up and down in it.
If you break down Genesis 6:1-8 You can see that those sons of God were not angels as angels are spirit and can not procreate nor are given in marriage, Matthew 22:30; Mark 12:25. 1Corinthians 15:39, 40 states that men are men, animals are animals, fish are fish and angels are angels. There is no scripture which would even remotely lead us to believe angels had sex with women or that Giants were born of them.
It was men who began to multiply on earth, Godly and ungodly men (not angels) and daughters were born unto them. The sons of God, Godly line of Seth, took them wives of the daughters of the ungodly line of Cain and choose wives from them. These daughters were more likely ungodly women being from the line of Cain and not of Seth. This is why God said my spirit shall not always strive with man, for that he also is flesh.
