Breaking Down The Bible. Genesis 6. The Sons of God and Noah’s Ark

Animals boarding the Noah's Ark (Jacopo Bassano workshop)

This is one of my favourite chapters of the Bible, and, from my point of view, one of the most enigmatic, too. If only someone had gone to the trouble of thinking about it carefully in the 2000 years that have passed since it was written.
Almost every line poses mind-boggling questions.

1. And it came to pass, when men began to multiply on the face of the earth, and daughters were born unto them,

Who were the mothers of these daughters?

2. That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose.