For all practical purposes, I am an Atheist. I lack belief in a God (or gods).
It is that, and only that, with which I can confidently say that I share with other Atheists. We're a diverse group.
While there certainly are trends, we're all individuals - our only shared 'rule' being to think for ourselves. In light of that, our specific attitudes towards religion itself are all placed on a spectrum: from outright anti-theistic to 'whatever floats their boat'-ness.
I, personally, am more inclined towards Dawkins' or Hitchens' take on it than not. In places, I see religion and superstition causing direct and measurable harm, and I feel that keeping this to myself is unfair - ultimately - to the victims.
But, as Dawkins and Hitchens don't either (but are misunderstood and misrepresented as doing so), I, when criticising religion, am not criticising religious people just for thinking in a certain way. I may severely dislike particular individuals, but I do not see 'moderate' religious people as anything other than a little deluded. In other words: I disagree with the thoughts, but I do not think, necesarily, that the people are stupid or immoral for - as is likely - simply having been born into and brought up within a certain world-view. Plus, many leave their parent's beliefs behind. Are they absolute idiots up to that point?
My specific use of the term 'deluded' should not be taken to be insulting either. It sounds it, I'll give you that; but there's simply no other way to express what I feel is an ignorance, whether wilful or not. I also detest the view that, say, those in the Middle-East 'don't know any better', or that us in 'The West' should avoid criticising certain practices in the name of cultural relativism. It's both patronising and untrue - again for the sake of victims and individuals.
Anyway, before I outline every one of my opinions, it's worth getting to the point of this post: is talking about these things, in public, an 'obsession' of Atheists?
I don't think so.
There are a few things at play here. The first obvious one is that the view that it is is a misunderstanding. True, some Atheists talk about religion a lot. But, in day-to-day life, with friends, I only mention it if relevant... What, then, makes it relevant?
I think it being in the news is a definite example. This shouldn't happen:
Person A: "Hey, did you watch the parliamentary debate on same-sex marriage?"
Person B: "Yeah, what did you think about it?"
Person A: "Isn't it funny that every single person arguing against allowing it did so for religious reasons?"
Person B: "YOU'RE SO OBSESSED WITH RELIGION!"