Why be atheist when you can be agnostic?
Because at least Atheists have the balls to admit that they believe God doesn't exist. And to an extent, they're right. But that's because Ceiling Cat does.
You can be both.
Gnostic = knowing
Agnostic = Not knowing
Theist = believe in god(s)
Atheist = don't believe in god.
I consider myself an agnostic theist, I believe a god exists, but I'm not about to make some bold claim, like I know one way or the other.