What Scripture says
Genesis 6:1–4 says that “the sons of God saw that the daughters of man were attractive. And they took as their wives any they chose… 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” (ESV).
Elsewhere in the Old Testament, “sons of God” refers to heavenly beings in God’s council (Job 1:6, 38:7). Jude 6 and 2 Peter 2:4 refer to angels who sinned and are kept in judgment, which many connect with Genesis 6 (see 3.6, 3.7).
What the evidence says
History
Where the alien idea comes from
The idea that the Nephilim were aliens, or the offspring of aliens, comes from the 20th-century “ancient astronaut” movement:
- Erich von Däniken’s Chariots of the Gods? (1968) argued that ancient monuments and myths, including Ezekiel’s vision of wheels (Ezekiel 1), showed visits from extraterrestrials.
- Zecharia Sitchin (1976 onward) claimed Sumerian texts described the Anunnaki, aliens from a planet called Nibiru, who genetically engineered humans. He linked them with the Nephilim.
- TV series such as Ancient Aliens (from 2009) spread these ideas widely.
Why scholars reject it
- Mistranslation. Specialists in Sumerian and Akkadian, and Old Testament scholar Michael Heiser, showed that Sitchin’s translations were wrong. Sumerian texts don’t describe a planet Nibiru as he claimed, or Anunnaki as space travellers. “Nephilim” doesn’t mean “those who came down from the heavens”, as Sitchin claimed; it is most often linked to the Hebrew root naphal, “to fall”, or possibly an Aramaic word for giants.
- Reading modern ideas back into ancient texts. The concept of aliens from other planets is modern. Genesis 6 describes heavenly beings (“sons of God”), in the context of the ancient Near Eastern belief in a divine council, not space travellers.
- No physical evidence. The monuments von Däniken pointed to, such as the pyramids and Nazca lines, have well-documented human explanations.
Interpretation
The real debate about Genesis 6 is among the traditional interpretations: fallen angels, the line of Seth, or ancient kings (see 3.7). The alien theory isn’t among the views scholars take seriously.
| Interpretation | Origin |
|---|---|
| Angels with human women | Ancient: 1 Enoch, Jude, early church writers |
| The line of Seth | From about the 4th century onward |
| Ancient kings or rulers | Some Jewish interpreters |
| Aliens | 20th-century popular books and TV |
Science
There is no scientific evidence of extraterrestrial visitors, ancient or modern. Some Christians do discuss whether life might exist elsewhere in the universe, but that is a separate question from Genesis 6.
Where they meet
There is no evidence the Nephilim were aliens. It’s a modern idea read back into Genesis 6.
What’s still open
Who the Nephilim were (see 3.7). The alien theory isn’t part of that scholarly debate.
Bottom line
There is no evidence. It’s a modern idea read back into Genesis 6. This is rated Settled.