Dear atheists

Lack of belief, huh? I show you "lack of belief", kiddo!

Why do YouTube atheists insist so adamantly that atheism is just "a lack of belief" in something (God or the God-concept, in this case), rather than an actual worldview? A bit like calling a lack of belief in the Great Pumpkin a-Great-Pumpkinist, and claim *that´s* a worldview, which would (of course) be absurd. Another favorite quip: "Atheism is to worldview as baldness is to hairstyle". 

But by their actual actions, American atheists clearly show that they *do* regard atheism as a worldview. They admit that they are hard or positive atheists, they call themselves "atheist activists", create organizations, hold conferences and form a distinct subculture. And when they want to combine their "lack of belief" in pumpkins, pardon, God, with actual beliefs in something, they call it "Atheism+" (Atheism-plus) rather than "Worldview-minus"...

What´s going on here?

The absence of belief in a monotheistic, transcendent, personal god who created the universe and makes demands on humans is obviously very different in kind from absence of belief in the Great Pumpkin, the Flying Spaghetti Monster, or the Invisible Pink Unicorn. How can it *not* have consequences for you worldview on a very basic level? 

Note also that the therm atheism is derived from an ancient Greek insult against the likes of Socrates, who obviously wasn´t persecuted for a simple "lack of belief" in great pumpkins on top of Mount Olympus. Socrates´ supposed denial of the gods was seen as a direct threat (and a threatening alternative worldview) to the established polis. 

Also, is there anyone except small children who are so uninformed about God or the God-concept that they literally lack any belief in it?

It´s true of course that atheism (as in deliberate rejection of all things religious and active struggle against same) can be combined with different worldviews, in the sense that an atheist could be anarchist, Communist, centrist, conservative, even fascist. But it will still be an important and defining aspect of that worldview, quite unlike any absence of belief in the Great Pumpkin, Santa Claus, Covfefe, Esmeralda and Keith, or what have you. And in the United States, I get the impression that most atheists (at least on the web) are libertarians, meaning that most of them *do* share a worldview. 

So what´s the problem, really?