Genesis 6 in the Bible speaks of the Nephilhim which is a Hebrew term " Those from heaven fell to earth" many call them fallen angels or The sons of God saw the daughters of men and took them as wives and bore children unto them.
The issue or problem to consider under the Hebrew texts which forms the old testament of such, one needs to compare other texts from other cultures such as the Mesopotamian, Babylonian,Sumerians, and Akkadian. These other cultures speak about plural dieties along with Egyptian Greek Roman etc. Only the Hebrew texts speak of one God and the Genesis story.
Yet, it is suggested the Hebrew texts was borrowed from the Sumerian Babylonian and the overall consensus from Sumer and Babylonia they all came from Extraterrestrial Gods.
To consider that why every other culture aside Judea Christian ideals they all believe in a pantheon of gods.
Only Judaism and Christian believe in one God.
In Genesis 6 God speaks to undocumented host of entities "Let us make man in our image in our likeness"
When God saw how people of the earth were of one tongue one culture with perhaps one goal to serve the gods. They were attempting to build a name for themselves lest they be scattered it was interpreted as a tower. Hence, known as the tower of Babel.
However, under the Sumerian and Babylonian context a name was a rocket.
A rocket to reach heaven to be with the gods.
When God saw this his response was Behold man has become like one of us, Let us go down and confound their language.
This was the start of different languages as people were scattered and lost contact of their original language. They learned to adapt to environmental conditions and basically had to start over.
Then when God saw how people were behaving once again he regretted making man because they were just not evolving according to his liking.
Yet, a little less known story from the sumerian texts about the shifting of the earth which caused the flood of Noah.
Hence, here is where civilization at that time was destroyed or disrupted once again.
Noah which is known by Sumer Mesopotamian texts is because he was a Mesopotamian.
So, God tells Noah and his family to build an Ark or boat to spare the animals and his family and so, once again the human race started over by Noah and his 3 sons and their wives.
Everyone should know the rest of that tale. In essence the current human culture was evolved through Noah and his family. Followed by Abraham who was the great great grandson of Noah.
Both the Arab and Jewish cultures recognize Abraham as the father of both nations.