Genesis 6.1-4 contains one of the strangest accounts in the Bible. Sons of god have sex with human women. Creatures called Nephilim are produced, who elsewhere in ancient Jewish texts are described as Giants.
In his April 2019 article for Bible and Interpretation, Jaap Doedens outlines the major alternatives for interpreting this odd passage. The article is based on his book, The Sons of God in Genesis 6:1–4: Analysis and History of Interpretation (Old Testament Studies 76.Leiden: Brill, 2019).
“Since the beginning of the 20th century, and especially after the numerous discoveries of similar expressions in extrabiblical texts, mainstream exegesis returned to a ‘superhuman’ interpretation of the ‘sons of God’ in Gen 6:1–4. Yet now they were not viewed as (fallen) angels, but as ‘divine beings’, or deities…. This newer exegetical solution is most probably the correct one.”