There were giants in the earth in those days; and also after that, when the sons of God
came in unto the daughters of men, and they bare children to them, who were Sons of Sons of God, the
same became mighty men which were of old, men of renown. The first
mention of "sons of God" in the Hebrew Bible occurs at Genesis 6:1–4.
John 1:14, 18; John 3:16, 18), Jesus presented himself as Son and not just as one who was the divinely appointed Messiah (and therefore "son" of God).
Jesus was/is one of the fallen angels. Son of God, just as the fallen angels are, just as the unfallen are.