I uploaded a book about them written by a professor of religion and already started to read it. I'm still at that outfit's beginning, it seems like they started out as a political activist group fighting for religious freedom and the seperation of state and church, disguised as a Satanist hoax out to shock conservative Christians, trying to get a statue of Eliphas Levi's Baphomet erected at state capitols, for example. That was in 2013/14, they might have evolved into something more genuine occult by now.
The Satanic Temple are non-theistic Satanists like LaVey's original Church of Satan, and both use "Hail Satan!" although they don't believe in him as a deity, more as a principle of individual freedom, or so I've read.