As far as I can tell, Satanism is no more a "Pagan" religion/tradition than it is a Christian one.
Satanism/Satan in the bible was supposed to be anti-everything christian. Drunkenness, Adultery, Thievery, Temptation, Corruption, etc. all of which were attributed to the Devil by Abrahamic peoples, who were his creators in the first place. Lucifer may represent rebellion or liberation to some people, but in the world of Paganism he is but a fictional character, except for people who practice/believe in aspects of all different kinds of religions and cultures and use that as a way to identify themselves as "pagan".
From a European perspective, what Satan represents in Abrahamic religion is as anti-European as it is anti-Christian. Greed, Corruption, Dishonesty, Deceit, etc. were all considered immoral and degenerate in most European cultures and many of its deities long before Christianity existed in Europe. That plus the fact that he is a foreign concept to European Pagan religions is why I see no reason for actual Pagans to attribute "Satan" to anything, except to try to appear as unique. "Paganism is anti-christian, but I'm a Pagan Satanist, so I'm really REALLY anti-christian". It's pointless.