Religion

and those are precisely the people who need to see that religious freedom doesn't just mean Christian religious freedom.

As for the insulting humor, though, I find the Satanic Temple coloring books and the Baphomet statues to be very tongue-in-cheek. They're really pretty funny, and I think they're meant to be.

In the end, thought, these guys are doing something important, and they're getting the message out, and as you point out, the message is going directly to the people who most need to see it.