Atheism is faith just like any other; belief that no god exists is just as substantiated (i.e. not at all) and provable (i.e. not at all) as the belief that particular god(s) exist.
It's also not as if any two unsubstantiated and unprovable positions are just as likely to be true; see Russell's teapot[1].
I think what you refer to as atheism seems closer to antitheism than anything else. The difference here is the same as the difference between "asocial" and "antisocial".
One can be an agnostic christian, for instance, in which case one would believe that it is unknown or unknowable whether the divine or supernatural exists (and believe in it still).
What I'm relating to the difference between "asocial" and "antisocial" is the difference between "atheist" and "antitheist".
For example, many people are vegetarian for one subjective reason or another. Just because I'm not vegetarian doesn't mean I believe being vegetarian is wrong or isn't a thing -- it just means I like eating meat and don't have the same reasons as vegetarians to subscribe to vegetarianism. And I don't think about vegetarianism, like how some atheists don't think about god; this stands in contrast with those who subscribe to religion, which requires active belief / prayer / practice / absorption of certain ideals into your identity.