They don't go after islam because islamists would cut their heads. Plus political incorrectness.
They don't go after judaism because it's politically incorrect, and most don't even find out what judaism is, despite the culture being saturated in it.
They don't go after budhism cause they see it as non-threatening, or as some form of psychological self-help bullshit. Tldr: budhists never go against muh science, so they aren't attacked.Plus, budhism is "a-historical" , so it fits with the fedora mind-frame: "there's many Buddhas, anyone can become a Buddha", vs "there's only one Son of God" .
Tough some change their mind if they see buddhists actually having a backbone and defending themselves against mudslimes:
https://www.colombotelegraph.com/index.php/full-text-of-the-banned-time-story-the-face-of-buddhist-terror/
As for the link you posted, that's not a religion. I'd see it more as a "post-ironic larp club" . Fedoras love irony, it allows them a small surrogate for religious experience without any of the commitment or conviction.
I got a chuckle out of this one:
https://www.facebook.com/lovechaosmagick/photos/a.1422047418081253.1073741829.1419728618313133/2056138911338764/?type=3&theater
Tldr: Christianity is the easiest and most readily available target for fedoras where you're at.