The problem with this argument in particular is that there is very little if anything that we know with a certainty does not exist. I cannot say with absolute confidence that werewolves do not exist, however my understanding of biology leads me to believe that there is no natural way that a werewolf could exist. On the same token, a god may very well exist, I cannot say with absolute certainty that one does not exist. However everything we know about the universe tells me that such beings are impossible, everything in existence follows one set of natural laws, anything that does not cannot exist. Agnosticism is safe, but one cannot be agnostic about every piece of mythology, why would this one be different? Werewolves or some variety of were-creature exist in every culture, but we must hold some degree of skepticism. I am comfortable say no god exists to the same degree that I say elves do not exist.
"In our youth, we lacked the maturity, the decency to create gods better than ourselves so that we might have something to aspire to. Instead we are left with a host of deities who were violent, narcissistic, vengeful bullies who reflected our own values. Our gods could have been anything we could imagine, and all we were capable of manifesting were gods who shared the worst of our natures."-Me
"Atheism leaves a man to sense, to philosophy, to natural piety, to laws, to reputation; all of which may be guides to an outward moral virtue, even if religion vanished; but religious superstition dismounts all these and erects an absolute monarchy in the minds of men." – Francis Bacon
"Atheism leaves a man to sense, to philosophy, to natural piety, to laws, to reputation; all of which may be guides to an outward moral virtue, even if religion vanished; but religious superstition dismounts all these and erects an absolute monarchy in the minds of men." – Francis Bacon