Some definitions of Devil him self
Devil: (from Latin "diabolus, and the Greek" diabolos "slanderer) The devil is in the Christian religion the spirit of evil, the evil genius. In theology, he is a fallen angel who opposes God. Since medieval iconography, the devil is the supreme leader of demons. It is therefore represented as a human monster, clawed at the terrifying figure, with long pointed ears, horns, a woman's breasts, legs and cloven a long tail. Able to take attractive appearances, he tries to bribe the man and dragged into sin.
Satan (Hebrew "haschatan" opponent). Satan, who appears often in the Bible, is the head of the angels who rebelled in Genesis, thus becoming demons. It was he who tempted Eve in Eden in the form of a snake or tempts Jesus in the Gospels. He lends the ability to change appearance to better win. Satan is represented as different traits, snake, half-man half-goat (inspired by the god Pan), dragon, Leviathan. He attributed the presidency of the Sabbath of witches.
Satan is honored as an adversary of God and the Church in worship called Satanism.
Lucifer (from the Latin "lux" light and "ferre" carry, literally, "light bearer"). As God Latin, Lucifer was the light bearer, the spirit of the air and personified knowledge. The term "bearer of light" was also used during the first centuries AD to describe Christ. Only High Middle Ages that the name Lucifer has been used to refer to Satan. In the Vulgate (the first translation of the Bible into Latin by St. Jerome), it is the transcription of the word in Hebrew Heylel "morning star" (Venus). Lucifer was the most beautiful of angels, head of the heavenly host. By pride and greed of power, he wanted to become like God and rebelled against him. Expelled from heaven and sent to hell, he became Satan, the leader of demons.
His rebellion is regarded by Gnostics as the research knowledge that God wanted to hide from men. Bearer of light, it would be for the Lucifer cults, more powerful than God, just Demiurge (Luciferianism). Not to be confused with Lucifer, Bishop of Cagliari, to 370, which caused a schism (Luciferian) by his tough attitude bishops supporters of Arianism.
