"The difference is the atheist says she’s an atheist, while the agnostic says she’s an agnostic."

Really, isn't a christian just someone who says they believe in a 'god' and behaves and acts in a certain way, while the atheists, etc, say they believe or don't believe in something else, and act in some other ways a bit differently?

Viewed from, perhaps, an aliens perspective, all they'd see is a bunch of humans proclaiming to believe this or not believe that, and running around doing or not doing certain activities, while actually sharing most other attributes - having limbs, a head, needing to eat, sleep - and everyone proclaiming themselves to be right and everyone else wrong . .