Here's some interesting data.
According to the Washington Post of Aug. 2012, 5% of Americans say they are atheist. The same article says that 60% of Americans say they are "religious" (and the author puts quotes around that, not me).
The article is about how atheism is on the rise in the U.S., but my point right now is to show you the gap between these. Despite the rise (from 1%), consider what small percentage there still are of atheists.
I found it sort of humorous when I found a website called "Urban Dictionary" that had a definition of " internet atheist" that defined the term as, quote, "an angry atheist who trolls internet sites denouncing God". i don't know the credibility of said website, but that it exists and this term and definition exist, is sort of interesting and funny.
I'm thinking about all the self proclaimed atheists on CM. There certainly seems to be quite a few. Either CM is disproportionately followed by atheists, or the atheists here like to comment a lot, or ...I don't know...