Is atheism self-contradictory ?

[Amarok]

I just want to know why objectivity is dependent on the existence of a creator. Seems like a pretty stupid means of declaring objectivity, since we exist and that apparently isn't enough. What is it intrinsically about existence that creates objectivity that nothing else seemingly can? And how can we know that a deity, regardless of other characteristics, is responsible for or the author of objectivity? Or that one is even necessary for it? It's just another arbitrary characteristic you choose to describe your favorite flavor of god with and it's as meaningless as all the others without evidence (and since all logic and evidence seem to also discount the possibility of these characteristics individually, that's even worse than just being neutral).

I mean, it's like saying that we can't have objectivity without that statue of a pissing cherub in my backyard fountain. If that wasn't there, we couldn't have X, Y or Z. Fuck off with that ridiculous shit, and feel ashamed of yourself for being that damned simple.

Indeed it's arbitrary as fudge and ultimately his whole case is a giant Tu quoque. And it's worst a certain elements like logic if objective and external cannot rely on god. And even characteristics like omniscience are ultimately circular . To a point where I could simply declare myself all knowing .