The Sons of God in Genesis 6 refers to angels and the offspring that they had gave rise to all kinds of myths and legends of gods and powerful creatures.  

This is not the only verse that talks about this and the consequences of their actions.  This episode explains the verses in the New Testament and the reasons why it will be important to know of these things in the End Times.

Christians have a duty to prepare for the future and we must also learn from the past.  

This is a very interesting and fun topic.  As always, I welcome comments and questions.