Smoke
Done here.
Well, I think the question is, Why do you think my atheism does fit into those categories? But I'll try to explain.please explain. Maybe im missing something.
1. a set of beliefs concerning the cause, nature, and purpose of the universe
I don't have any beliefs about the purpose of the universe. The universe has no purpose that I'm aware of. Such beliefs as I have about the cause and nature of the universe are not dogmatic beliefs and are not informed by my atheism. They're basically the same beliefs as I had when I was a Christian, and they are now, as they were then, subject to change in the light of new information.
2. a specific fundamental set of beliefs and practices generally agreed upon by a number of persons or sects
I don't have any specific atheist beliefs or practices, unless you call not going to church an atheist practice, in which case every Jew and Muslim on earth is an atheist. I'm a Buddhist. You will have noticed that Richard Dawkins is not a Buddhist. Bertrand Russell, an atheist whom I greatly admire, was very critical of Buddhism. What are the beliefs and practices we generally agree on? Well, secularism, but I was a secularist when I was a Christian, too. That's not an atheist thing.
3. the body of persons adhering to a particular set of beliefs and practices
That's basically the same thing as #2, it's just talking about the adherents of the religion instead of the religion as such.
The fact that I'm an atheist doesn't tell you what I am; it tells you something I'm not. It doesn't tell you what I believe, it tells you one kind of belief I don't have. It doesn't tell you what I practice; not even that I don't go to church. Some atheists do, you know. I've gone to church a few times since I realized I was an atheist, and I expect to go again. I actually would like to take my husband to an Orthodox liturgy sometime, and the reason I keep putting it off is that I'm afraid he won't like it. I want him to see how beautiful it is and appreciate it as I do. Now, is that a specifically atheist attitude? I don't think so.
An atheist might believe anything at all except theism. An atheist might practice anything at all, even including participating in theistic religions. Although I honestly can't understand why not, it's not even true that all atheists are secularists. What we have in common is what we don't believe, and the fact that we are subjected to the aggressive religiosity of those who do believe -- and not all of us are even bothered by that, though I am.