Do you believe there are giant purple space bunnies who live in caves on the far side of the moon?

Sure, technically speaking there might be, but there is nothing in our experience of the real world that would give us any reason to give such an absurd proposition a moment's thought.

When most atheists assert a lack of belief in "God", this is what they mean -- that the probability of a "God" existing is infinitesimal, and it's best to go about life not worrying about "God" any more than one would worry about gigantic purple space bunnies.

So why do atheists spend so much time talking about something they don't believe in? Because the influence of religion in our society (particularly Christianity in the U.S.) is so pervasive that it seems normal. In spite of the alleged benefit of religions, they have caused a lot of evil in the world, so why should we accept the massive brainwashing of children to believe in these ancient myths as something "normal"? So atheists must be the ones who appear to make noise, but they're up against the deafening silence of a monolithic status quo which is horribly broken and must be fixed.

Here, listen to a real atheist, and find out what they're actually talking about, instead of just trying to imagine what they must think.
http://www.ted.com/talks/richard_dawkins_on_militant_atheism.html

Replying to un-hide the anonymous parent comment ... but a more relevant link is here:

http://www.iol.ie/~locka/mozilla/control.htm

... just what the doctor ordered.