Who or What is a Satan?

"The greatest trick the Devil ever pulled was convincing the world he didn't exist." --Verbal from "The Usual Suspects" "We may not pay Satan reverence, for that would be indiscreet, but we can at least respect his talent..." --Mark Twain According to the Oxford Dictionary of World Mythology , expounds on Satan, explaining: "Belief in malevolent beings which haunt the air and the secret places of the earth stemmed from early man's instinctive fear of the unknown, the strange and frightening. In West Asia this common superstition expressed itself potently in a variety of ways: the Egyptians struggled against Ammut, the 'eater of the dead', and the serpent Apophis daily threatened the sun god Re; the Babylonians attributed sickness and misfortune to demonic attack, while at night men were endangered by Lilitu, a beautiful winged succubus; the Hebrews had to cope with a host of fallen angels under the crafty leadership of S...