Why Do Atheist Tell Everybody They Dont Believe In God? Is Atheism Another Religion?

Because they are voicing their opinion. Atheism btw is believing in no religion.

No not at all for something to be a religion you have to faith to believe it. It doesn't take faith to not believe in god like it doesn't take faith not to believe in santa. Some people might say they are atheists because they don't want anyone to ask them to go to church of something, I don't say " Hey every one I don' believe in god!" and I am an atheist.

For the same reason I tell women that I have herpes. It's a part of who I am, and they deserve to know.

I can't speak for other atheists, but I don't go preaching around my neighborhood like a door to door salesman. I have no god to sell.

Why do we tell people we don't believe in god? Isn't "because we don't" enough of an answer? Are we supposed to pretend to believe in god in order to be true atheists, or what?
I wasn't aware having an opinion on something and not hiding it was the definition of a religion, but thanks for the info.
I deduct from your answers that you're a polytheist, then, worshipping at the altar of Selena Gomez and Miley Cyrus and creamy blue carpets.

I think that atheism isn't a religion.  It is the state of not having a religion.

Actually, atheism is not having any religion

No, it can't really be a "religion" since it means that the person doesn't believe in any religion.

Hmm~~~>polytechnic~~> of, or dealing-with many arts or sciences... sounds like your doing a good job young~blood, after all, knowledge is power... In my opinion i believe atheist tell everybody that they don't believe in god because they are angry lost soles and misery loves company... And they ~~~>the self proclaimed atheist, are verbally compelled to ( tell everybody ) in hopes to find ~~~> any company... Sad but true... hope this helps, and best wishes

Generally speaking, they don't in my experience have any need to tell everyone they are atheists. We're not trying to sell some mythical religion, unlike you guys.

I don't tell anybody I " don't believe in god " as I tell them I have no belief in gods.

A subtle but real difference that puts the burden of proof where it belongs, on the religious claimant.

It's not really a religion, an atheist is someone who believes in evolution (like me)

They don't believe in anything :) So they're just being honest lol. They just *shrug* don't believe in a God or...anything.
 
Which is fine. More power to them. It's a comfortable way of life for some people and other's should most definately respect that.
 
Diversity is a beautiful thing.

I think that there is no such thing as a true atheist. What I find to be interesting though is the top two things on a supposed atheist's list are 1) there is no god. 2) I hate him. You can't hate someone or something you don't think exists.  

Because thats there belief if you don't believe in god tell the people who may persuade you to go to church or read the bible its like being burned alive for us. The athiest does not believe in no god theres no super monster in space looking down on us its only us. I laugh at everyone you believes in it. Theres no reason the believe in something that doesn't exsist he doesn't exsist
can you touch him taste him feel him see him if you can't its not real

Atheists say that they don't believe in God because atheism means someone who doesn't believe in God. They're not just saying it; that's their belief!

Atheist-ism is a religion. (with no evidence of NO GOD).
They can't prove it. Just as evolution can't be proved.

Atheism is not another religion. It is merely a belief you and other non God believers hold.

Usually, religion (either what flavour, or lack of religion) doesn't come up that often when I'm just chatting with friends. About the only time I talk about being an atheist is when some obnoxiously smug Christian comes along and tries to tell me what I need in my life. Or what my child should be allowed to learn, or watch, or play, or say, or think.

That's when I start to get nasty.

It's an Anti-Religon Religon.It's Akin to What Stalin and Hitler did trying to get people to worship the State!

Why do religious fanatics tell everyone theyre religious? Not every atheist is like that, not every religious person is like that. Some people just like to argue, and that doesnt depend on which religion you are.