[Leatherneck_MT]

I’m not going to try and dispute your belief, but there is a reference after the flood of a separate “race” of beings that the author refers to as The Sons of God. They are also referred to as the Nephilim.

I have never heard a good explanation as to what these people are or were. Aliens? Angels? (fallen or otherwise).

It adds to the mystery in my opinion.

[JamesP81]

I have never heard a good explanation as to what these people are or were. Aliens? Angels? (fallen or otherwise).

There are a couple of common beliefs. One of the common beliefs is that the Nephilim were indeed fallen angels. Another common view is that the Nephilim (or 'Sons of God') were male descendants of Seth and the 'Daughters of Men' were descendants of Cain. In both cases, the two groups intermarried and this displeased God enough to cause the Flood.

I've never really studied it, so I don't have an opinion.