This puts the Atheist in the same boat as the theist: with a belief that lacks any evidence.
a- = without
theism = belief in a deity
atheism = without belief in a deity
Agnosticism and atheism aren't mutually exclusive. You can be an agnostic atheist (i.e. you don't believe in any god and you claim there is no way to know this for fact) or you can be a gnostic atheist (i.e. you don't believe any god and you claim to know this as fact). Most atheists are agnostic atheists.