Well, I don't think most atheists do that. (IIRC, someone (EY?) proposed to use untheist for someone who doesn't believe in God and antitheist for what you say.)

ETA: IIUC there is a very large social stigma attached to atheism in America, so I guess that over there only people who are pretty sure of their position would self-identify as atheists; so probably in America the fraction of self-identified atheists who “present philosophical and scientific critiques of god beliefs” would be a lot greater. Where I am, theists and atheists might jokingly mock each other much like fans of different football teams would, but most of them don't usually try to convert each other any more than fans of different football teams would -- I suspect many people would even see that as rude in most situations.