Hello Simon,
concerning your question and more precisely this point:
“... the larger-than-life Greek heroes were the same
nephilim or "mighty ones of old" mentioned in the bible.”
here are the result of a -quick - research
N° 1 *** w94 2/1 5-6 Agents of Evil ***
The account continues at Genesis 6:4: “The Nephilim proved to be in the earth in those days, and also after that, when the sons of the true God continued to have relations with the daughters of men and they bore sons to them, they were the mighty ones who were of old, the men of fame.” These hybrid sons born to women and fathered by angels were abnormally strong, “mighty ones.” They were men of violence, or Nephi·lim', a Hebrew word that means “those who cause others to fall down.”
It is noteworthy that these events later found expression in the legends of ancient civilizations. For example, a 4,000-year-old Babylonian epic describes the superhuman exploits of Gilgamesh, a mighty, violent demigod whose “lust [left] no virgin to her lover.” Another example, from Greek legend, is the superhuman Hercules (or Heracles). Born to Alcmene, a human, and fathered by the god Zeus, Hercules set out on a series of violent adventures after killing his wife and children in a fit of madness. Although such tales were greatly distorted as they passed from generation to generation, they tie in with what the Bible says about the Nephilim and their rebellious angelic fathers.
N° 2 *** it-2 492-3 Nephilim ***
Increased Wickedness. “The mighty ones who were of old, the men of fame” that were produced by these marriages, were not men of fame with God, for they did not survive the Flood, as did Noah and his family. They were “Nephilim,” bullies, tyrants, who no doubt helped to make conditions worse. Their angelic fathers, knowing the construction of the human body and being able to materialize, were not creating life, but lived in these human bodies and, cohabiting with women, brought forth children. Their children, “mighty ones,” were therefore unauthorized hybrids. Apparently the Nephilim did not, in turn, have children.
In Mythology. The fame and dread of the Nephilim, it appears, gave rise to many mythologies of heathen people who, after the confusion of languages at Babel, were scattered throughout the earth. Though the historical forms of the Genesis account were greatly distorted and embellished, there was a remarkable resemblance in these ancient mythologies (those of the Greeks being only one example), in which gods and goddesses mated with humans to produce superhuman heroes and fearful demigods having god-man characteristics.—See GREECE, GREEKS (Greek Religion).
N°3 *** it-1 1001 Greece, Greeks ***
There is evidence of Babylonian influence on Greek religion. One ancient Greek fable is nearly a literal translation of an Akkadian original.
Another poet, Hesiod, probably of the eighth century B.C.E., is credited with systematizing the multitude of Greek myths and legends. Together with the Homeric poems, Hesiod’s Theogony formed the principal sacred writings, or theology, of the Greeks.
In considering the Greek myths, it is of interest to see how the Bible sheds light on their possible or even probable origin. As Genesis 6:1-13 shows, prior to the Flood, angelic sons of God came to earth, evidently materializing in human form, and cohabited with attractive women. They produced offspring who were called Nephilim, or Fellers, that is, “those who cause others to fall down.” The result of this unnatural union of spirit creatures with humans, and the hybrid race it produced, was an earth filled with immorality and violence. (Compare Jude 6; 1Pe 3:19, 20; 2Pe 2:4, 5; see NEPHILIM.) Like others of the post-Flood times, Javan, the progenitor of the Greek people, undoubtedly heard the account of pre-Flood times and circumstances, likely from his father Japheth, a survivor of the Flood. Note, now, what the writings attributed to Homer and Hesiod reveal.
The numerous gods and goddesses they described had human form and great beauty, though often being gigantic and superhuman. They ate, drank, slept, had sexual intercourse among themselves or even with humans, lived as families, quarreled and fought, seduced and raped. Though supposedly holy and immortal, they were capable of any type of deceit and crime. They could move among mankind either visibly or invisibly. Later Greek writers and philosophers sought to purge the accounts of Homer and Hesiod of some of the more vile acts attributed to the gods.
These accounts may reflect, although in greatly expanded, embellished, and distorted form, the authentic account of pre-Flood conditions found in Genesis. A further remarkable correspondency is that, in addition to the principal gods, the Greek legends describe demigods or heroes who were of both divine and human descent. These demigods were of superhuman strength but were mortal (Hercules being the only one of them granted the privilege of attaining immortality). The demigods thus bear a marked similarity to the Nephilim in the Genesis account."
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I hope this will help you. Pleased to have done - something just for you -
receive my greetings, James Charles MacHislopp