The discussion of the Nephilim, Nimrod, fallen angels and their influence on biblical history has been a topic largely avoided by the church. But the topic is so important to the biblical narrative that it begins in Genesis and ends in Revelation. For the Christian redeemed in the blood of Jesus, it is a vital subject in understanding the biblical story.
And as it was in the days of Noe, so shall it be also in the days of the Son of man. Luke 17:26
The following video provides an easy, understandable introduction to the subject.