The Satanic Temple is actually really bad at "their thing." They lose the majority of their cases and their primary attorney has been repeatedly sanctioned. They're 1A grifters.
If you actually care about 1st Amendment protections you should be supporting groups like FFRF or the ACLU instead
The Satanic Temple regularly gets sanctioned in court, because they’re utterly incompetent buffoons. In Belle Plaine for example, the city acquiesced to threats and gave neutral treatment, and ST sued anyway, lost, then tried to sue again and got sanctioned for it.
And what also bugs me is that they go out of their way to set up the grounds for these cases from the bottom up and then still lose them. People like FFRF take actual cases, not manufactured controversies.