Atheism, assuming we're talking about true atheism and not just some form of agnosticism, has an article of faith as its central tenet, since it assumes an untestable hypothesis. Any hypothesis about the supernatural, including the null hypothesis, cannot be tested scientifically. That's what "supernatural" means: outside of nature, and therefore not required to be consistent with any other observed principle of the material world.
So yes, atheism is a faith, if not a religion per se.
Someone who's serious about not committing to untestable beliefs would be an agnostic, ideally a Perfect Bayesian Reasoner agnostic aware of the formal limitation on belief in consistency (from doxastic logic). That's about as uncommitted-to-unprovable-propositions as you can get.
In reality, of course, the ability of the human mind to avoid unproven and unprovable assumptions is extremely limited. Even in conscious thought, it requires continual vigilance, which carries a high cognitive load and can't be sustained for long stretches. In the preconscious and unconscious, forget it.
Biting the hand that feeds IT
