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Have you seen one?
See:
Serpent Seed (False) Doctrine
Recommended reading:
Alien Encounters by Chuck Missler and Mark Eastman
My mother was duped into believing in serpent seed doctrine by Arnold Murray and The Sheppard's Chapel.
They trick people into believing Eve had sex with the snake because of the phrasing "And I will put enmity between you and the woman, and between your seed and her Seed; He shall bruise your head, and you shall bruise His heel (Genesis 3:15)."
They tell their people that Eve was pregnant with twins and that Satan's child was cain and Adam's was abel, Your seed and her's references the twins with different fathers according to the fools and liars.
They ignore what comes immediately after in the same verse about how the human will crush the snakes head and the snake will attempt to strike at the human's heel. enmity between species of Human and Snake, the offspring of the serpent and Eve. The verse proceeding it discusses the punishments God gave to the serpent, eating dust and having to crawl on the ground, which gives even more indication that God is referring to punishing the serpent and his serpent offspring.
Thankfully I talked her out of this ridiculous and disgusting belief, by explaining that "your seed" refers to the snakes SNAKE children.