anyone who professes any definite knowledge, at this point, about the existence of god/s is not an atheist; [...]
Unfortunately for you, the commonly accepted of "strong atheist" (aka "positive atheism," "hard atheist," or "gnostic atheist") means precisely that.
This vein of argument floats around this forum in various guises continually, and the scenario is all too common. When a "strong atheist" outlines his reasons for believing there are no deities, the critics call his arguments into question primarily by the expedient of moving the goalposts (or, perhaps more accurately, denying the existence of goalposts altogether). That is to say, they come up with hypothetical examples of "gods" which can, admittedly, not be disproven, but which unfortunately bear almost no resemblance to any commonly used definition of the term "god."
Like
Huh-What?, I say there are no gods,
if we take the term "god" to mean:
any supernatural being worshipped as controlling some part of the world or some aspect of life or who is the personification of a force [syn: deity, divinity, immortal]
(source: WordNet 2.0®, via Dictionary.com)
By this definition (which pretty much covers every god posited by theistic belief systems throughout human history), a god must exert direct influence on human experience; the effect of this influence should be detectable, and thus provide evidence of the god's existence. The absence of such evidence, therefore,
does constitute evidence of absence, since if the god's influence cannot be detected, that means that the entity either does not exist (except in human imagination), or does not meet the definition of "god" outlined above.
The God of the three Abrahamic religions, of course, has the benefit of many centuries of rationalizing why the above argument does not apply, but is vulnerable to the challenge to theodicy posed by the existence of suffering (not merely due to evil inflicted by "free-willed" humans, but also as a result of natural disasters).
I can't honestly lay claim to "definite knowledge," but strong atheism is not founded on mere faith.