Since the question is back on the table with this weekend's release of the Noah flop film, here is an answer deep from the archives.
As it turns out, the Nephilim have everything to do with Christian boys who lust after the Emma Watsons of the world and nothing to do with fantastic CGI rock giants or prurient alien angel-demons.
WHO WERE THE NEPHILIM?
An exegetical study of Genesis 6.
CONTEXT
According to the O and NT’s, Moses was the author of the Torah[1]. His audience was a post-Exodus, pre-conquest Israel. His main spiritual concerns would have been:
A. education – Israelite [and Canaanite] history and that of the land she was to inhabit;
B. Faith in God through hardship and uncertainty [grumbling vs perseverance - especially while traveling; trusting God as He works in time and processes; being subverted by the temptations of food, idolatry, and compromise with powerful empire-builders];
and C. Purity through separation [ethical and marital; being subverted by women].
All three of these themes are nearly omnipresent subtexts undergirding every portion of Genesis. They explain the content and emphasis of nearly everything contained therein.
All three of these themes are nearly omnipresent subtexts undergirding every portion of Genesis. They explain the content and emphasis of nearly everything contained therein.
To answer the question at hand, I would like to key in on the third concern – spiritual purity and marriage. At the risk of overstating my case, if Genesis were written today as a sensational political paperback, it would be called something like: “Setting the Record Straight: The true history of the Israelite Nation: how women, paganism, and faithless compromise almost destroyed God’s people, why Canaan is rightfully theirs and why the bloodthirsty, idolaters must be driven from it.”