Satanism, as envisioned by The Satanic Temple, is more or less compatible with UU philosophy. But TST has been showing they are far more concerned with activism than religion, so many of their congregations (mine included) have split off to be unaffiliated Satanists.

It looks like they're thinking of religion as having two categories—supernatural or science based—with TST being science based. I can see their reasonings/motivations for classing themselves as a religion but it seems to work only on a philosophical level. Any links for info on your congregation?