The story told is that the Church, when it began evangelizing pagan areas of Europe transformed the old Celtic horned god Cernunnos and the old Roman god Saturn (depicted as a goat) into the biblical Satan.
There’s an interesting anthropological story here with horned gods in a great many different cultures being transformed into the Devil.
There is probably some truth to the theme. They, literally, demonized pagan gods.
However and evenso, it remains that, as Paul says, the worship of any god other than the God of Scripture is idolatry and the worship of demons.
Satanism is a religion of selfishness, Wicca claims to not be selfish, citing things like the “rede” (‘An ye harm none, do what ye will’), at the same time, however, it claims to be able to manipulate elemental forces. This puts the effective custodianship of these forces into the hands on individuals who may or may not have the ability or interest in using this “rede” responsibly.
My experience has been that Wicca is perceived as an avenue of empowerment for people who feel disempowered by whatever circumstances they consider are “keeping them down”. The same kind of dynamic is true of any number of religions, of fascism, of communism and of any number of cultural/political “movements”.
People become Wiccan because it’s spooky-cool and different and promises them some modicum of control over themselves and their environment.
So then, is Wicca a religion of selfishness or is it merely a religion of nature-worship? It can be the latter, which is idolatry and demon worship, but as often as not it is the former and has the former built into it despite any posture to the contrary.