Since outing myself as an atheist a couple of months ago I've gotten a steady stream of links, memes and photos sent my way that I should be interested in. 99% of the time however, I'm not.
I look at religion the same way I do sexuality. I don't let my (lack of) religion define me as a person any more than I do my heterosexuality. I was just discussing this with a lesbian friend of mine and how she makes it a point not to go to gay pride rallies or gay bars. Pigeonholing yourself into a certain group of people closes off an entire world of experiences. Being an atheist or gay isn't any more important than being a Cubs fan or liking pizza or being afraid of spiders.
By no means should you not be proud of who you are. Just don't let one facet of your being overshadow everything else.