The concept of Satan (Baphomet is often taken as THE symbol of satanism) as anti-God is very old and mainly arose out of dislike of the kind of godly God invented for themselves before trying to inflict it on as many humans as they can. could. Naturally, the anti-social and evil people needed a concept of God just as much as their better-native brethren, and so they ultimately chose the character of Satan, leader of the opposition so to speak, to serve as a symbol for their cause. common. If Satan was a rebel against Heaven, then they were rebellious against those in society who claimed Heaven as a legitimate reward for their earthly conduct. Simple enmity magnified to a metaphysical standard of living. The eternal "us and them" syndrome.
They can be presented as personifications of all of our worst flaws and tendencies - everything we need to eliminate from our characters, in the same way we need to remove waste from our bodies.