Are they demons or fallen angels that were allowed to mingle with God's creation?
Genesis 6:1 - 4
MSG - 1 When the human race began to increase, with more and more daughters being born, the sons of God noticed that the daughters of men were beautiful. They looked them over and picked out wives for themselves. 3 Then God said, "I'm not going to breathe life into men and women endlessly. Eventually they're going to die; from now on they can expect a life span of 120 years.
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
The 3 answers so far seem OK, but I am not sure of them. The Holy Spirit is working to give me an answer, but I am not that smart to put two and two together. The answers are not clear and hopefully someone whom has received the correct answer will post it. Some people get answers for different questions. God always gives us answers in His own time. Do we really know who the "Sons of God were?". They are surely different from the Angels that we know more about. I am still questioning that question.