In case there are things you always wanted to ask but never got the chance... Going to start this off with some common topics that usually come up.
What is an "atheist"?
At a minimum, atheist is a person who, when asked "Do you believe that God exists?", answers "No I do not have that belief". Atheists may go further and have positive beliefs about nonexistence of gods, but that is not necessary.
Does being an atheist mean that I am making an affirmative claim that no Gods exist?
No, I am not making any claims. I simply do not accept claims that God/Gods exist. I am doing that without making any claims of my own. Some atheists do have an affirmative belief that no Gods exist, but one can be an atheist without that.
Who banged the Big Bang, why does the Universe exist, how did life emerge from non-life?
Some questions are meaningless (what is the purpose of mountains?), other questions can be answered with a simple "we do not yet know that". It is OK to say that we do not know something. As a matter of fact, it is preferable to say that, rather than make things up.
Where do I get my morality?
Evolution has no problem explaining emergence of morality in social animals. However, this should not be viewed as a blanket endorsement of our natural inclinations. What is natural is not necessarily what is good.
What about evidence of design in the natural world?
Indeed the natural world shows evidence of design. However, it does not show evidence of a designer. This can be counter-intuitive. There is a split between some atheists about whether it is more appropriate to call it merely "apparent design" (Richard Dawkins) or actual "design without a designer" (Daniel Dennett).
What about people who say that religion fulfills a particular and necessary purpose?
Consolation, social support, inspiration, charity, etc - these are all important and necessary things. It would be a difficult situation if religion were indeed the only way to get those.
What about Stalin/Mao/Hitler/etc?
While some of those those were self-professed atheists, they did not do bad things in the name of atheism. Hopefully we can all agree that any form of dogmatism is bad, including dogmatic atheism. Atheism is sometimes slandered as being inherently dogmatic; that is not the case.
What do atheists believe about death, souls, etc?
I suppose different atheists can have different opinions on that... but most atheists would probably say that your person-hood is entirely contained within your brain, and it faces annihilation when your brain dies.