I don't believe there is anything fundamental about the term "atheist"
There isn't, or at least it's not as if thousands of other terms are just as important or more so. I only single out "atheist" because that's under discussion. I rarely get into debates over self-labels, because people will simply call themselves what they wish. However, what I do find worth engaging is when a such a label is not simply defined in relation to one's personal beliefs but to define the word for all, and even
then I typically don't bother. I've spent most of my posts not so much defining atheism at all but arguing against the view that a different definition can't be used while another one must be.
I think the term I've debated the most is probably the word "theory". I study language, and although I study it mostly as it pertains to the brain I didn't start doing this. In the course of learning the ancient and modern languages I need to know for one of my undergrad majors I became interested in linguistics. It was through linguistics that I came to cognitive science and then neuroscience. So language and logic (and where they connect and disconnect) are quite important to me.
But none of that would be enough for me to bother if some were not trying to assert things about labels that
1) are meant to be taken as universal, not self-labels
2) are claimed to be logical in ways that they cannot be
3) are used to deny, universally, self-labels of others (for example, the claim that atheists aren't theists would mean I am an atheist and I am not).
considering this word is not describing a structure or an organization
Neither is racism, sexism, or prejudice. Considering that most debates, including those that influence culture and politics, deal with ideologies and worldviews, I don't understand why you believe words describing a structure or an organization are somehow necessarily of no or little consequence.
it is merely a view on theistic grounds, a stance on theological issues.
It's also making claims about what people can and can't say about their own identity and worldview. Also, inaccurate claims about language and logic matter to me personally whether it's over a word from a dead language.
So what importance does it hold?
What importance does anything hold?
You do not believe X, although that can mean two things: You do not have an opinion on it, or that your opinion is that of a negative one, a no.
It is possible to not believe because one doesn't know. Apart from anything to do with language itself, it is physically impossible not to have an opinion of a word like "god" or "atheism" or "theism" if one is able to use these words correctly, communicate them so that others speaking the same language can understand, and to situate them in the proper syntactic and semantic structures. I tried to explain this several times and, as that failed, provided several different sources on this point. It's true that someone who is aware of the concept of god (i.e., is able to use the word) can care so little that it almost never comes to mind. But it is not true to say that person has no opinions even if they are implicit. The very neural representation corresponding to the word and the contexts the speaker uses it cause the speaker to ascribe to it properties they believe it to have. Unimportant and irrelevant can be considered two.
What could these dogmatic positions do anyhow?
What all dogmatic positions can do. Stifle thought, progress, discussion, etc.
What effect would they take on society if a term is misused in such an example?
It's not that the term itself is "misused". That happens all the time and words change. The issue is the rationale for the two problems I've discussed. Theological debates inform public policy, culture and cultural progress, education, etc. So, for example, when theists claim that the difference between them and atheists is simply that they both belief something about god, it just happens to be different beliefs, they are wrong. It is this kind of justification that is used to defend practices and policies I don't agree with and is similar in many respects to defenses of teaching creationism in school.
Likewise, the rejoinder that atheism is simply some default position that involves no belief claims is flawed too. Instead of promoting the differences between belief that X exists and belief that X does not, and why these make the claim that atheists and theists simply have differing beliefs about god, the response is to claim that atheism is a lack of belief. Rather than responding with logical arguments about the invalidity of the claim, an invalid rejoinder is offered. Such tactics in debates and discussions hamper and hinder rather than help.
The problems I have been discussing here are less about definitions in and of themselves but about both the justification for (or against) them and whether or not their interpretations make sense. This thread involves ascribing as a natural state to human beings something I believe cannot be said of them. Muslims make the same claim and I would argue here too. I find that the term atheism is an important one so long as policies and cultures all over the world are influenced by theists and theistic beliefs. Atheism is a label (and like all labels involves some ambiguity and vagueness) that is useful to inform discussions vital to sociocultural issues. Calling rocks and babies and anything else that has no belief about gods as well as those who believe god doesn't exist but claim that phrasing this differently somehow makes the "lack any belief" the way a baby does makes atheism meaningless. Same with defining it as "not a theist". If I like a lot of what a self-described atheist politician seems to represent things I like, and so I vote for her, I'd be pretty upset to find out that she is a scientologist. The fact that scientologists don't call the immortal, omniscient entities they believe in aren't gods but forms of humans and a "supreme being".
just because someone is professed an atheist although lacking the idea of theism
It is impossible to be a professed atheist (unless one has no idea what the word means) and lack the idea of theism. One of the reasons this is true is related to why this issue is important, IMO. Concepts do not exist in isolation and neither do the words we use for them. One doesn't need a word to have a concept of not being a theist or for believing god doesn't exist (the converse is not true- to have a word one must have a concept). Concepts like war are defined at least in part by their relation to peace, soldiers, weapons, etc. The concept of war today is not that of a thousand years ago in part because we associate with it things like bombs, tanks, machine guns, etc. Making "atheism" devoid of any practical meaning has implications for the words it relates to, as these are all defined in part, just like atheism, by the relations between them and atheism.
But there isn't going to be a worldview or ideology in the mind a newborn as there is no concept.
That's true. But we ascribing to a newborn what
is a worldview. By doing so we make the term corresponding to it useless and by extension the create problems with the use of terms relating to it. This has already happened, as many an atheist could have been perfectly described by the term agnostic were it not for attempts to redefine atheism as including non-commitment.
But someone cannot believe in "God" unless there is some sort of concept of it.
I agree. And babies have no concept of god. People who describe themselves as atheists do.