Direct Answer
Genesis 6:1–4 teaches that human rebellion is not only a matter of breaking moral rules but of transgressing the boundaries by which God ordered creation. The flood narrative shows that erasing God-established distinctions produces disorder severe enough to require divine de-creation.
Discussion
Genesis 6:1–4 is one of the more mysterious and, in some ways, controversial passages in the Bible. The verses have sparked centuries of debate about the identity of the sons of God, the daughters of men, and the Nephilim. While I have my own thoughts on these identities, we do not have to reach an iron-clad conclusion to grasp the theological insights this passage provides. Despite the difficulties associated with interpreting Deuteronomy 32:8, the New Testament texts (Jude 6; 1 Peter 3:19–20) tend to suggest that the “sons of God” are divine figures and that the “daughters of men” are human women. The boundary crossed would have involved marital and sexual union of two separate sorts of beings — not of the same kind. Heavenly beings mating with human women would have been seen as problematic because of the grasping to overcome human limitations that the union provided.
Throughout Genesis 1, God is described as seeing that the various aspects of creation he has just made are good (Gen 1:4, 10, 12, 18, 21, 25, 31). The meaning of the phrase has the sense of determining or judging. In Genesis 3, the woman sees that the tree of knowledge of good and evil is good for food and desirable for making one wise and takes the fruit and eats it. Here, the woman makes a judgment independent of and in opposition to God. Genesis 6 contains a similar pattern: the “sons of God” see that the daughters of men are good (normally translated “beautiful,” but the same Hebrew word as “good”) and take whichever they choose. The repetition of the pattern suggests that the narrative is confronting a similar, underlying problem — a boundary that God has set is being transgressed.
The idea of boundaries is slightly different than the way we normally think about rebellion or sin. In essence, when we look at the creation narrative, we see God distinguishing between different kinds. Light is separate from darkness (1:3), waters above from waters below (1:6–8), earth from water (1:9–10). God's creation involved setting things in order — creating distinct entities that needed to stay within a particular set of boundaries. Transgressing those boundaries creates disorder. In Genesis 6:1–4, we see a divine boundary being transgressed. The sons of God and the daughters of men were to remain separate. Their union is incommensurate with God's created design — the distinctions God has made are being blurred. The blurring of boundaries in Genesis 6 results in the multiplication of evil (6:5). When we transgress God's boundaries, we live into disorder. As boundaries are blurred and distinctions made unclear, the world becomes increasingly difficult to navigate because we don't know where to go, how to move, or what we're doing.
Key Takeaways: Genesis 6 and Boundary Crossing
Core Concept — The “See-Good-Take” Pattern
The same Hebrew verbal pattern links Genesis 3:6 and Genesis 6:2, framing the Flood as a continuation of Edenic rebellion rather than a discrete crisis.
Core Concept — Order Through Distinction
Creation is constituted by God's boundary-setting (light/dark, water/land, kind/kind); transgressing those boundaries is not adjacent to rebellion, it is rebellion.
Scripture / Scholars
Genesis 1; Genesis 3:1–7; Genesis 6:1–5; Jude 6; 1 Peter 3:19–20; Deuteronomy 32:8.
The “So What”
When the church starts treating God-given distinctions as obstacles to be overcome rather than orders to be respected, it is participating in the Genesis 6 grasp — whatever else it tells itself it is doing.