(This is a post by a U.S. citizen, in essence about the U.S., but which also broadly applies to the rest of the world as well.)
Having read the entirety of this thread, and been around the block more than once on religious/atheist/anti-religious matters; I'll throw out a few thoughts here.
A very popular stance is that humanity exists in a fantasy world, where ones religious flavor achieved it's present societal position, and maintains said position, due to sugar, spice, and everything nice. But let's not kid ourselves here and neglect to list a little chemical X. The dominating religions of today, acquired their positions through force, killing off their competitors, and eating whatever made them better fit for survival.
If they had not, then they would not be the dominating religions. Instead they would be, at best, a sideline faith; trying to gain momentum on the fringe, while continuously being stepped upon by the dominates; in an effort themselves to stay on top.
Atheism is one of those 'faiths' on the fringe quickly gaining momentum. Those on top, from a societal point of view, realize this and respond accordingly: there is a reason atheists are viewed as the crap of the crap on the bottom of a crap covered shoe. I'll not go into details, but being a publicly vocal atheist in the U.S. is a remarkably difficult thing to do; and what I mean by publicly vocal atheist, is simply that it is known that you are an atheist.
Which leads to the very unsurprising outspoken atheists on the internet; where social, and potentially economic suicide, hopefully not literal(depends on location), doesn't take place, for voicing ones opinion.
Final thoughts: Why bother looking at religions from an internal perspective, just view it's origins and development as a cult itself; everything else falls into line after that. Here's a good lead at what I'm talking about: http://www.youtube.com/watch?feature=iv&v=JOmSYHzeoNA&annotation_id=annotation_786156