I agree those things you mentioned aren't very popular, and possibly where you are the mainstream culture is different than where I am, but I don't see any of those things as counter-culture in the sense that none of them are opposed by the dominant culture. e.g. If it came out at work that you were a member of a group that fought with foam swords, had unusual sexual preferences, or were funny atheists, you wouldn't be fired. People might say "oh, that's weird" but they aren't going to hate you.
I'm not saying any of those things are bad (in fact, I like fighting with fake swords) but there's not hostility to them from the culture and they, in turn, are not hostile to the mainstream culture, so I just don't think they're countercultural at all.
By definition I think countercultural groups will strike you as weird and bad unless you belong to them specifically. Q-Anon, for example, which speculates that the leaders of society are <bad things>, is a countercultural group because they both hate and oppose elements of the main culture and are hated and opposed by it. The kind of antifa or anarchists who are attempting to burn down courthouses or police stations in Portland are another clear example.
I think that FSM does satisfy your stricter definition of counterculture. Like the Church of Satan, one of the stated goals is to force legal examination of whether or not "freedom of religion" actually means "freedom to practice Christianity".
LARPing and kink also have some opposition by fairly mainstream religious-types. They're seen as counterculture, even if they don't define themselves that way. Sorry. Changing my mind on kink -- that's a really big umbrella. Some people get off on being shamed for whatever it is they're into. Those folk are only satisfied when seen as counterculture.
Maybe the FSM is counter cultural but only in the way that housecats and lions are both felines. There is a very large difference between trying to hang Mike Pence or kill police and believing that established religions are illogical. Maybe it's slightly countercultural in the areas where Christianity or other religions predominate (which is not where I live).
I have family that literally think that Harry Potter turns children to Satanism, and think that the books should be banned on that basis (JKR was cancelled on the right long before she was cancelled on the left). You might consider those folks to belong to a counterculture in your context, but Evangelical Christianity is extremely popular in large swathes of the US.
And yes, both lions and housecats are felines. There's gradients and degrees. I'd call the folks you're talking about as "extremists" not a mere counterculture.
I'm not saying any of those things are bad (in fact, I like fighting with fake swords) but there's not hostility to them from the culture and they, in turn, are not hostile to the mainstream culture, so I just don't think they're countercultural at all.
By definition I think countercultural groups will strike you as weird and bad unless you belong to them specifically. Q-Anon, for example, which speculates that the leaders of society are <bad things>, is a countercultural group because they both hate and oppose elements of the main culture and are hated and opposed by it. The kind of antifa or anarchists who are attempting to burn down courthouses or police stations in Portland are another clear example.