But if the Sons of God were not men, but angels, who about the period indicated left their “proper habitation,” and came to earth for the purpose of gratifying unlawful and unnatural desires, we have, in this, a cause at once adequate and likely to produce the unparalleled evil, which led to the ruin of the old world. Were not fallen spirits, dwelling amongst mankind, and intimately associated with them, very capable of producing the gross and widely-spread depravity of conduct and morals, which prevailed in those times? And was not this depravity a natural result of the abode on earth, not only of these fallen but powerful beings, but also of another mighty and lawless race, who owed their origin to them?
When we reflect on the evil which fallen spirits have wrought in this world-of the untold miseries which one successful act of an evil angel has caused to our race-of the power exercised by such spirits, and the ills which they inflicted on individuals, at the time of the sojourn on earth of Him, who will eventually bruise the serpent’s head-we discern in the character and degree of the evil prevalent in the antediluvian age, the strongest reason for believing that fallen angels, and their offspring, were the prime cause and authors of it.
~from “The Fallen Angels and the Heroes of Mythology” by John Fleming