What Genesis actually says
The Nephilim first appear in the brief and difficult account before Noah’s flood. Genesis says they were on the earth when the “sons of God” took wives from the “daughters of men”, and it connects them with mighty men and men of renown (Genesis 6:1-4). The passage does not directly explain who the Nephilim were, where they came from, or how the groups in the story relate to each other.
Their Hebrew name is often linked with the idea of fallen ones, though its precise meaning is not certain. Some older Bible translations use “giants”, and the description may include unusual size or strength. Yet Genesis itself puts more emphasis on the growing violence and evil of humanity than on satisfying our curiosity about the Nephilim (Genesis 6:5).
There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty men which were of old, men of renown.
Why Christians read it differently
One view understands the “sons of God” as angels who rebelled and entered unlawful relationships with women. Supporters note that angelic beings are called sons of God in Job (Job 1:6), and they connect this reading with passages about angels who sinned and left their proper place (2 Peter 2:4; Jude 1:6). Even so, neither passage names the Nephilim, so that connection is an interpretation rather than an explicit statement.
Another view sees the sons of God as people from the family line that worshipped God, perhaps the descendants of Seth, while the daughters of men represent a godless line. On this reading, the tragedy is marriage without faithfulness to God, contributing to the moral collapse described before the flood. A third view takes “sons of God” as powerful human rulers who abused their position by taking women as they pleased. Genesis leaves room for these readings.
What about the giants in Numbers?
The name appears again when frightened Israelite spies report seeing descendants of Anak in Canaan. They say they saw Nephilim and felt like grasshoppers beside them (Numbers 13:32-33). But this report comes from men trying to persuade Israel not to enter the land. The next chapter shows that their fear helped spread distrust of God’s promise (Numbers 14:1-4).
That does not prove every detail was false. Anak’s descendants were clearly regarded as formidable people, and Israel later faced them in the land (Joshua 11:21-22). Still, the spies’ own language may be exaggerated by panic. Their report should not be used to build a detailed theory about ancient giants that Scripture itself never supplies.
And there we saw the giants, the sons of Anak, which come of the giants: and we were in our own sight as grasshoppers, and so we were in their sight.
What matters most
The Nephilim are real figures in the biblical story, but God has not given a full explanation of them. It is all right to hold a view with humility. The Bible’s main point in Genesis 6 is not to make us anxious about mysterious beings. It shows a world deeply corrupted by sin, then introduces Noah as a man who walked with God (Genesis 6:8-9).
So read the passages carefully, notice where Scripture is clear, and be cautious where it is not. The mystery is genuine. But the larger message is clear: God sees human violence and evil, God judges rightly, and God preserves those who trust him.