(Atheism requires just as much faith as theism, since atheists still must "believe" in the unprovable.)
For example, it takes more faith to believe that there is a psychic duck flying through space deliberately diverting meteors from hitting the Earth so that Earth will have time to develop civilization, than it does to believe that there is no such duck, even though the lack of a psychic space duck is not disprovable because he could always have just used his psychic powers to erase the memory of anybody who tries to make an observation. A being of logic would not include the possibility of the psychic duck just because it had heard of the concept -- that would be biasing its decisions toward old ideas.
Your statement is common, but it's a variation on saying that something has a 50% chance of being broken: either it is broker, or it isn't. It's a facile analysis and it's unfair to both atheists and theists.
Regardless, everybody has to agree on definitions. Wikipedia says:
Atheism is, in a broad sense, the rejection of belief in the existence of deities. In a narrower sense, atheism is specifically the position that there are no deities. Most inclusively, atheism is the absence of belief that any deities exist. Atheism is contrasted with theism, which, in its most general form, is the belief that at least one deity exists.
The "most inclusive" definition is not an aberration or a vandalism, and is the one used here.
Agnosticism is the view that the truth values of certain claims – especially metaphysical and religious claims such as whether or not God, the divine or the supernatural exist – are unknown and perhaps unknowable.
People aren't born believing that they can't possibly know whether or not God exists, that's a conclusion that rational people make.
As corollary, agnosticism is not incompatible with atheism and in the strictest sense isn't even incompatible with theism or the stricter senses of atheism (in that you can acknowledge a truth value as strictly unknowable without regarding it as a 50/50 even-money option, like the psychic duck).