I appreciate that. But, not myself subscribing to any particular religion - nor indeed to atheism - I'm rather careful to not let the odd "God damn it" slip out. Call me quirky that way.
As someone who has gone through learning a new language in a new and unfamiliar place three times (when I was a baby and I learned Polish counts, right?

), I just go with whatever the accepted popular vernacular is... for the most part. If I came to Canada and people were cursing Thor when their hockey team lost, I would likely eventually do it too, and not think too much of it. I guess I see things like "God dammit!" and "By the fury of Thor!" from that pov. They seem silly unless you are used to them, and when you are used to them they don't really have to make sense either. It's like any other social custom.
It is indeed. But it doesn't do any harm to point out that that is exactly what I'm doing, from time to time. Inb4 someone tells me I'm "laying down the law" about some issue. Which I'm at pains not to be doing.
I think maybe you worry too much, because your posts are usually very chill, or at least they seem like it to me. The most I've ever assumed about you must have been that you're chillin back in a large and comfy office chair, sipping on some whiskey, maybe smoking a pipe, casually responding to things.
And, if you think that Christianity (or Islam) is this vast monolithic system of belief, I'm afraid there's a bit of news for you out in RL. Isn't there something like 40,000 recognized Christian denominations? Each member of which no doubt holds some ever-changing version/interpretation/muddled thinking about it.
Well, no, I do not think that. Christians are all united in following Christ (for the most part).. This implies certain things and certain expectations. And each one of those churches adds even more expectations and implications on top of that, depending on which one you belong to, as a Christian.
That is actually a very good way to contrast what I meant earlier when I said that we don't have a club - and thus no common expectations placed upon us.
And if your core "belief" (well, let's not call it belief, say "thesis") is that all religions are superstitious nonsense, this is tantamount to saying "NEVER TRY RELIGION - IT'S IRRATIONAL."
But now you are re-defining the word "atheist" and what it means to be one. There are indeed atheists who think that all religions are superstitious nonsense, but that is not the core thing that makes atheists.
What makes us atheists is simply the fact that we do not believe that God exists. That is the core thing: We are defined by the lack of something. That's really why it doesn't make sense for us to have a club - except for those of us who have more specific beliefs like the one you outlined above, for example.
But most of us don't even care about the whole debate enough to actually join a club - a place where you meet up and discuss this crap with other atheists. Every group of people has a vocal subset, and those more vocal people usually tend to have stronger and usually more extreme opinions than the majority and the mainstream of whichever particular group you're talking about.
So the picture you're trying to paint would only work if you're talking about those atheists with those actual specific beliefs, and ones that are strong enough for them to warrant to sit down around a table and to talk about it in a raised voice.
So, while you say you don't have a club, I rather think you do. It's just not a "funny hats wearing" club, but a "let's not wear funny hats" club. That is, any one caught wearing a funny hat is no longer a member of this club.
A more apt analogy would be, if all the people who wear silly hats and decide to meet about it, do meet about it, and then decide that anybody who is not at the meeting has a club of their own. Meanwhile Bob could be sitting at home, not even knowing that silly hats exist, being bundled into this definition.
You could say: but religion is different, everybody knows about it! But imagine a world in which silly hats and whether you choose to wear or not wear them is a big deal. Sure, you could have a bunch of non-silly-hat wearing people form their own club and start making pronouncements about how stupid it is to wear a silly hat.
But by grouping Bob with those extremists and their positions on the question of silly hats, when the only association he had with them was.. none.. Is a disservice to Bob, the guy who couldn't care less, but deserves our respect.
Admit it now. You do feel more comfortable amongst other members of this "let's not wear funny hats" club, don't you? After all, you share a common distaste for all things superstitious.
I consider myself to be an armchair intellectual, so of course I don't believe in superstitions of any sort, except ones that influence me using scientific principles like maybe the placebo effect. The only reason I might feel more comfortable among other people who are thinkers and resort to reason, is because we speak the same language. It doesn't mean that we're going to sit down and start a club though, because most people who brand themselves as intellectuals are knowitalls and any club planning is bound to result in chaos and eventual violence.