You might be thinking of The Satanic Temple and other modern start ups that are basically humanitarian agnostics but do the Satanic aesthetic to be like "You say a nativity scene is fine, okay, then a Bathumet statue has to be fine" or apply to do the rotating opening prayer for school board meetings and do a little devil chant or w/e. The vast majority don't believe in the existence of Satan: supernatural evil being.

They're pretty good, if you're the type of person to look at society and the thing you wanna put the most effort into fixing is Christianity being all up in the state.

I think they do some abortion rights stuff though which is cool.