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Some Christians believe that demons arose from the Nephilim, supposed children of Watchers with human women, who died in the Flood and had their souls imprisoned on earth. This idea is actually a corruption of the Rephaim, spirits of dead kings and heroes who ruled over parts of the underworld of Mot. "Giant" doesn't mean "large". It means "earthborn". Nowhere in your KJV or other English language Bible will you find the statement, "The Nephilim were very large men". That's a back-exegesis from the historical convention of using "gigantes" to translate 'nephilim', 'rephaim', 'anakim', etc. "Gigants" was originally chosen to translate "nephilim" and "rephaim" in the Septuagint according to the technical sense of ancient demi-divine warrior-heroes of a chthonic character and with a sort of cultic funerary significance.
Returning to talking about Kabbalah, according to the Jews, Noah received it as part of the Oral Torah on Mount Sinai, according to the Zohar, the patriarch Abraham also received Kabbalah from his ancestor Eber, great-great-grandson of Noah, who received the Kabbalah of the Angel Raziel, the angel of Chokmah, who generated Binah (Saturn). The Jewish Kabbalah is a compendium of more ancient wisdom (Sumerian/Babylonian, Egyptian/Greek and prehistoric, lost in the mists of time) mixed with the practices and reflections of some Jewish mystical currents like Maaseh Breishit and Maaseh Merkavah. It was not by chance that the first explicitly Kabbalist text was only written in the Middle Ages. Until then, it was all discreet (Gematria is a powerful tool, tada) and Oral Tradition.