u/EscapeThisMatrix

Pretty simple question - what are the differences between the Demiurge and Biblical Satan, Devil and Lucifer?

As far as I understand, Demiurge is the fallen, defective god who created this realm and all the heavens above it. Satan used to be one of his minions but rebelled, but not in the sense of rebelled for the sake of saving humanity and each little soul, but for his own thing? So who is the Devil then? Both seem to be malevolent beings and "Devil" is more like a title in my opinion. Or is this all just one and the same being, that's not exactly right in the head and has this bipolar tendencies? What about Lucifer then?