Who are the Nephilim?
Question: Who are the Nephilim in the Bible? Were they GIANTS?
Answer: Your question concerns Bible verses that are well known to many who study God's word. The Nephilim did indeed exist before Noah's flood. These giants came into the world when the earth was experiencing a population explosion (Genesis 6:1). Just how many people lived just before the deluge? The period from Adam's creation (about 3984 B.C.) to just before the waters covered the globe (2328 B.C.) is roughly 1,650 years. Conservative estimates place the population of the world around one billion!
One common question is who were the "sons of God" who married women and produced these giants? Some believe they were demons, fallen angels who took the form of human flesh so that they could produce giants. This theory does not make any sense, since there is no place in the Bible where God calls demons his "sons."
There is another problem with the idea that angels (either righteous or fallen) and women were able to produce a race of giants called Nephilim. The Bible says the sons of God took WIVES for themselves, meaning they were MARRIED, and together they produced giant children (read Genesis 6:2 again). It does NOT say these women were raped or otherwise violated sexually before marriage and had children out of wedlock.
Marriage is an institution God began in Eden (Genesis 2:24 - 25) that receives its authority and binding nature DIRECTLY from him in heaven (see Matthew 19:1 - 6). There is not even a HINT in scripture that God ever spoke about, conducted, or approved of angelic beings somehow 'marrying' humans. Those who argue that these 'sons' were angels have yet to produce proof that God has expanded his will regarding marriage, and the producing of potential spiritual sons and daughters, to angels.