No. I believe every Atheist should be an Agnostic.
well possibly.
the thing is, many non-believers don't look into it in that much detail. They simply don't believe in god, and thereofre say they're an atheist, as this more well known in poplular culture.
I am guilty of this.
TBH, having just looked at the defeinitions of both, they are very similar, although i fall on the side of atheism, as although i can't prove that their isn't a God, i also don't believe there is one either.
Ago's seem to say whilst they can't prove their isn't a God, they don't really know either way and so don't believe anything.
Or at least that's how i understand it?