Originally Posted by Dust McAlan
Indeed, the chapter in question notes that there "were giants [nephilim] in the earth in those days; and also after that, when the sons of God came in unto the daughters of men..." decidedly inferencing the idea that the nephilim were there BEFORE man, and came to them after the fact.
The passage suggests nothing of the kind.
"The Nephilim were on the earth in those days, and also afterward, when the sons of God came in to the daughters of man and they bore children to them. These were the mighty men who were of old, the men of renown."
Clearly the text suggests that the Nephilim were only present *after* man, given the text's explanation that the Nephilim are human offspring (and identified as "men," regardless of what their parentage was).
The Nephilim also appear later on in the Biblical texts, since the "sons of Anak" are said to be the descendants of the Nephilim. They, too, are described as tall, giant-like people, and their presence is one of the reasons the Hebrew people are so reluctant to move into the land of Israel.