"While I'm not an atheist, I do see why someone in 2013 would take exception to this saying."
Sometimes, someone is just tired after a very long day, a less than wonderful day, is a tad irritable, and just got finished reading yet another story about yet another self-proclaimed 'christian' who speaks/acts/etc. in a way that is anything but what jesus taught, and therefore reacts to yet another 'we're all christians when times get tough' dumbass statement (see, I did it again) in a highly irritable way. Sometimes it's just that simple, nothing fanatical, nothing significant, just a bad-tempered wince expressed through a keyboard. We are all, after all, human, and exceptionally imperfect.
"Not all Christians are fanatics just like not all atheists are fanatics."
So true. A few of my good friends are christians, one is an atheist, one is a buddhist, a couple are agnostics. Only one is a fanatic, and I don't talk religion with him. The rest of us don't care one way or the other about what the rest of us believe. We ALL believe in treating people fairly, kindness, tolerance/acceptance (choose your flavor). Most of us believe that adding water to a good single malt is a sin.
My own take is that too much time is spent arguing/fighting/even worse about god and religion. It just doesn't matter (not to me most days, anyway, which is why most days I simply ignore it). And it often just gets in the way of treating people decently - because far too often such discussions seem to focus on what we disagree on (and then finding a reason to consciously 'exclude' people) instead of what we agree on.
In short, I don't give a hoot whether or not god exists, I don't really spend any time thinking about it. And I've never tried to persuade anyone else of god's existence or lack thereof.