Atticus implied commonality to most athiests not "some".
Yes, it was of course hyperbole, I just didn't want to mention it because it would be like explaining your jokes. Also Eran guessed it right, I am atheist in the sense that I don't believe in God (but not in the stronger sense that I would deny the possibilty of god's existence).
Now little more explicitly, most atheist or agnostics are decent folk, but some, especially young ones, can be very aggressive. Many of them seem to be building sense of superiority by arguing against christians, which at least in this part of the world is very much like arguing against children against existence of Father Christmas, since converting is done mostly by Jehova's witnesses who doesn't offer very good arguments (this isn't meant as an insult, only description).
I don't think belief in god itself can be shown to be inconsistent, if you don't suppose that believer takes the Bible literally for example. Believers on the other hand might have had experiences which give basis to their beliefs, or they might choose to believe someone who has had such experiences. Those feelings aren't on the same level that eyesight or hearing: ordinary senses can trick us too, but we all share those senses. In this case atheists do not use their "inner deity-sense" to observe that there is no god, but they lack that sense (at least I do, and please if someone is going to deny this, do it on genuine feeling, not just because you can deny it).
Now as believers can't demand that other people take that feeling as convincing argument, neither can non-believers deny that that feeling is valid argument
for the believer to build his/hers own worldview.
At this point some atheists stop claiming that they can show belief in god inconsistent, and start to argue about negative consequences of religion: historical atrocities (which of course are historical, and not valid therefore), and contemporary narrowmidedness. However this is not efficient way to broaden their mind. If someone has strong feeling of god, he very unlikely abandons his belief due to any arguments on the existence of god. Instead you can broaden his mind from inside of his beliefs. At least for christians it is more than possible, Jesus didn't preach for bigotry.