Which arguments? Those for atheism in general or those the "new atheists" offer? Also, just to anticipate a possible response:
"I've heard numerous folks, atheists as well as theists, declare that we can never prove there's no God because it's impossible to prove a negative.
We can indeed prove negatives, and we do so all the time. In fact, if we couldn't prove a negative, we couldn't prove a positive either, since every positive statement implies negative statements (an infinite number of them, actually) . If I prove that 'all the marbles in this box are white', I automatically also prove that 'none of the marbles in this box are blue', 'none of the marbles in this box are transparent' , and so on."
Steele, D. R. (2008).
Atheism Explained: From Folly to Philosophy. Open Court.
Central arguments include the many varieties of what is variously called the "argument of/from evil", "the problem of evil", etc. Another class concerns the incoherence (indeed, inability for any intelligible formulation) of a "God" with the attributes most frequently ascribed (omnipotence, omniscience, infinitely benevolent/wholly "good", creator/designer of all that is, divinely given free will, etc.). Then there are the arguments that are usually called "negative" and include e.g., the closing of the gaps in "god of the gaps" arguments. Most of the arguments are not so easily defined, as they begin and are intricately tied to the nature of epistemic justification, evidence, justified true belief (JTB), ontology, etc. Also, unlike the handful of (mostly related) arguments
for god (especially the "proofs"), they are frequently not singular but concern the nature of existence and in particular human existence vs. religious beliefs about this existence.
Actually it exists as several organizations and it is most certainly a movement. Maybe you didn't read carefully (or at all), but I'll add a bit more and emphasize different parts:
"Although much of the content of the new atheism may have precedents, what is original is the new found urgency in the message of atheism, as well as a kind of
atheist social revival that their writings,
lectures, and conferences have produced. In other words, the ‘new’ atheism is not entirely about new ideas, but a kind of
evangelical revival and repackaging of old ideas. One only needs to peruse
the Converts’ Corner on RichardDawkins.net to get
a sense of the influence of the new atheism. The thousands of reader comments posted on the site state ad nauseum that
The God Delusion had given them the arguments and the courage to confidently profess their atheism (see also Bullivant 2008a)."
(ibid)
Within this quote alone, we see an example of one such organization (albeit an online one) and the implicit existence of others ("conferences" require significant organization, and without a significant following no lectures can exist). More importantly, "atheist social revival" describes a
movement. A handful of authors cannot constitute either such a revival or an atheist "evangelical revival".
Further, "Michael Borer’s chapter examines the debates surrounding the rise and decline of the ‘secularization thesis’...Placing the new atheists within the historical and ongoing debates about secularization sheds light on
new atheism as a minority ‘movement’ that aims to show how and why religious faith is an inferior form of knowledge that, in turn, fosters misguided worldviews." (ibid).
And finally a more positive spin: "Cimino and Smith argue that the new atheist books and the responses, debates, and criticisms they have generated create a new space where atheists are empowered and
mobilized through their interaction and contention with each other and with their antagonists." (emphasis added)
I don't know about you, but mobilization suggests both organization and movement to me.
We may add unofficial organizations using identity theory and other frameworks from sociology simply by noting Dawkins' introduction of "brights" and the "brights movement". And then of course there is "The Dawkin's Circle" (which requires fees for membership), the various "atheist churches" or "church for non-believers" that have sprung up such as the
First Church of Atheism (you can get ordained!) among others (
Atheist 'mega-churches' look for nonbelievers), and so on.
I dismissed their arguments as being intellectually sterile. So do many atheist philosophers. Theologians tend to gloat over how easily dismantled their arguments are (one author remarked that when he would teach courses in seminary intended to present the works of the great contributors to the atheist intellectual tradition in order to ensure both that those ordained were familiar with such arguments and to make them truly challenge their own beliefs, usually a few students would drop-out, unable to handle such challenges; none of the new atheist books would be acceptable because they are too easily addressed).