Is Atheism A Religion?

I'm a bit wary of Christians who say that Atheism is a religion, but to give them their due, a lot of atheists aren't helping the case against the claim.

Symbols

All faiths have a symbol to represent them. Christians have the cross or the fish, Jews have the star of David, and so on.
Atheists inspired by their dedication to 'science' have come up with a few of their own badges.

You'll notice that most of them look a bit like atoms, which are bit like the poster child for science. Shoving an 'A' into an atom just cements the atheist relationship with scientific discovery and thought.

It's maybe a bit arrogant to assume that atheists have the only claim to science. Considering facts like Joseph J. Thomson, the founder of atomic physics was a devout Christian. Or that Charles Darwin, whose theory of evolution inspires the atheist fish, was a Christian for most of his life. Or Isaac Newton, Galileo, or even modern day leaders of science like Francis Collins were also Christian.

So, as atheists have a number of symbols to choose from, it's only natural that they would want to display their faith for all to see.

Or if clothing and accessories aren't enough, why not permanently seal the deal and have the symbol of your belief inked?

And they say atheism is just "a lack of belief"... Sure...

Churches

Do I need to go further than this point? Atheists have churches now, They meet up on Sundays and share their faith and learn how they can use it to make the world a better place. Come on!