I don't understand why the standard for knowledge switches from reasonable certainty to absolute certainty in conversations that are about the existence of God, even peripherally. And anything less than absolute certainty get's labeled "faith" by believers and "agnosticism" by nonbelievers.
I was helping out at an "Ask an Atheist" table last Wednesday and had to bite my tongue as I listened to two theists and one agnostic agreeing with each other that we couldn't really *know* that there wasn't a Leprechaun hiding in the back corner of the bookstore where no one could see.
The fuck we can't!
Yes, in some navel-gazing, purely philosophical way, we have to be intellectually honest and admit there is a non-zero epistemic probability that there is a Leprechaun that hides in book stores. But that doesn't mean we can't say we know there isn't one. No one holds themselves to that standard of knowledge in pretty much any walk of life. No one ever stands up during a murder trial and says "hold on a minute, guys. A wizard may have done this. We can't know who's guilty." and then they all nod their heads in agreement and drop the charges. We try, convict, imprison, and even execute people based on a standard of the absence of reasonable doubt. Even in literal life-and-death situations, we don't hold ourselves to a standard of absolute certainty.
I can understand why some nonbelievers do this. Some of them have a strong aversion to saying anything that smacks of dogmatism, which makes sense coming from the backgrounds that some of them escaped from. Others want to be able to argue without having to take up the burden of proof, which is forgivable when they haven't had time to sort out a positive worldview after ditching their old one, but is pretty weak when it's just a tactic to keep their side of the debate easier.
And I understand why some believers do this. Some like to take what I call the nuclear option where they nuke epistemology itself and try to level the playing field that way. Everything gets labeled "faith," and all faith claims are presumed to be equal. Oh, you have faith that the sun will come up tomorrow? Well, then that validates my faith that a man was raised from the dead.
We don't need to play word games. We don't need to pretend it's arrogant to say that you know something when you truly think the evidence is overwhelmingly on your side. We don't need to slip into black-and-white thinking in one area when we accept probability and nuance in every other. We really don't.