Why, do you ask, should i care?
"[The satanists] do intend to mock the rituals of the Catholic church in their services; it is these acts of mockery that make up their services and serve as an integral part of their religious practice." via ABC News.
I mean really. Do I have to explain myself here? While I am not signing petitions or asking anyone to stop doing what they are doing, I am pointing out that sure, they have the right to assemble in a public place, but this is not upholding religious freedom, unless "Anti-Catholicism" is a legit religion now. Try Anti-Islam or Anti-Buddhism or Anti-Veganism -- yeah, not a religion people, that's a mockery of others beliefs and has no inherently good value. Fun fact: that's all the Devil knows how to do because he's not God and so there. Ha. We win (and by we I mean God, then thankfully us along with Him).
Don't worry though; they're using vinegar instead of urine at the City Hall ritual. Because, well, they have to (health codes and all that).