It’s been common in the last couple of decades for atheists to attempt to redefine atheism as a “lack of belief in God” as opposed to “a belief that God does not exist.” I’ve examined the errors of this endeavor before (here, here, and here).
From time-to-time, you’ll also see atheists getting even more creative with their labels. One that has interested me is the label “agnostic atheist.” This so-called position takes the redefinition of atheism as its starting point, and then adds to it the uncertainty that is implied by “agnostic.” An agnostic atheist, then, is someone who lacks a belief in God but does not know for sure whether God exists or not.*