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some divine beings noticed how attractive human women were, so they took wives for themselves from a selection that pleased them.
https://stevenmcollins.com/who-the-nephilim-were-and-werent/
With that introduction, let’s evaluate the theory that the nephilim are the offspring of fallen angels and human females. The very concept goes utterly against the Genesis 1 Divine Law that all creatures must reproduce via male-female unions within the same Genesis “kind.” Man-kind and angel-kind are not of the same Genesis “kind;” therefore, they cannot reproduce via any kind of sexual union. Also, Jesus taught that angels do not marry at all in the heavenly realm (Matthew 22:30), nor is there the slightest biblical evidence that they can reproduce baby angels. When a portion of the angels followed Lucifer and rebelled vs. God and were hurled back to earth (Isaiah 14:13-14, Luke 10:18, Jude 6), it is impossible that the fallen angels would suddenly gain a new power (to reproduce with human females) that they did not have prior to their fall and dis-empowerment. No angel (righteous or fallen) has any DNA or any human sperm in their bodies to fertilize an egg, so the entire idea of angelic-human reproductive unions is a non-starter. It can “happen” in Greek mythology or in science fiction, but not in the real world.