@snood,
Not all atheists say unequivocally that there is no god. I think for most it's just a residual reaction, so that when confronted with god-based issues, they just say, "I don't believe that."
I would suggest to you further, that most people who are described as atheists (they don't necessarily label themselves, either), don't get into those kinds of discussions. I suggest that it is the militant atheist, or the militant agnostic who brings such things up.
But you are missing a point here, Snood. For the atheist, no one needs to get in their face. They are surrounded by god delusion everywhere. Christmas (the damned stores are closed), Easter (the damned stores are closed), Thanksgiving (yes, it's a religious holiday started by Lincoln, and yes, the damned stores are closed)--religious ceremonies to open Congress, religious ceremonies to open the Supreme Court, religious ceremonies at goddamned school football games, for pity's sake.
We are constantly surrounded by and bombarded by theistic messages. If some of the crew go off the deep end, and start ranting, small wonder. As i've said here many, many times--in real life, this never comes up for me. Just as with any strongly held belief, it is the lunatic fringe rather than the common run of believers (or, in this case, those who don't believe) who raise a stink. Then y'all take that as typical of all of the set, on the squeaky wheel principle.