According to 2nd Peter 1:20 you may not interpret scripture privately. So the "sons of God" must be defined by other scripture. Here what research will show;
- The "Son of God" is Jesus - begotten of God
- The "sons of God" are Believers who have been born of the Father by FAITH through the Holy Spirit (Jn.1:12-13, 3:6)
- Adam is a "son of God" because he had his ORIGIN in God
- The "sons of God" are beings who rejoiced when the earth was made, and who include Satan (Job.1:6, 2:1, 38:7). Satan is an angel.
- The "sons of God" in Genesis 6 are in OPPOSITION to "the daughters of MEN". If they were of Seth's line they would be "sons of MEN" (See Gen.6:1)
- Angels, although their substance is spirit, have bodies. In every sighting of any angel in the Bible he had a body. The two angels that went to Sodom first ate with Abraham.
- Angels who sinned at Noah's time, "left their 'FIRST' estate". The word "first estate" in Jude 6 means "their beginning", or "what they were made for", and/or "their principality". That is, their actions are not disputed, but they are accused of dealing outside the realm they were placed in. If the "sons of MEN" mated with women they would not have "left their original purpose".
After perusing the evidence the only "sons of God" who mated with "daughters of MEN" must be angels.