ROTFLMAO! You do realise that these people are just taking the mickey, right? I mean, if they called it "The Humanist Club", or "The Secular Society", they'd be ignored, right? But call themselves Satanists, and loads of folk get their knickers in a twist and they get lots of free publicity!
You're being played, and making yourselves look like simple-minded Medieaval peasants.
Satan is Yahwehs' Quality Control Officer - he tests faith and obedience, as he did with Job, at Yahwehs' behest.
Lucifer - Bringer of Light - is the God of the New Testament. Bringing the Gnostic Truth to defy Yahweh, the demiurgic Rex Mundi.