Been there for a long period of my life, have joined many groups and organizations. After a while I've realized being true to my self, atheist movement in itself is an organized religion. It makes sense and it feels good to each individual about the whole experience of atheism, but the force to form a group to be recognized and have some legal rights and be known of our existence has gone back to what they were against - organized religion in the first place. In a nut shell, aethist movement has has become a religion. Calling themselves non-conformist, they have set themselves as conformist by following their ideology. It's the rule of the nature, anything that gets big, becomes a organized institution.
So it's all fine on individual level, but when atheist groups show up in the news demanding this and that, it's all BS-just like any other religion.