I take the first position, but disagree with conclusion that's made. In my view, the impossibility of not knowing if there is a God or not doesn't rule it out, where atheism is ruling out the possibility of whether a god or divine being or whatever label you want to call it exists, or maybe at the very least leaning towards that view.
Like I don't believe in any God that has been presented to me, but at the same time I put the probability of that one existing at the same unknown percentage that any other possibility exists. Considering that the ultimate part of this is me not knowing in the first place, I never felt it was worth much of my time or effort to consider the probabilities in the first place, other than that I refuse to rule anything out no matter how nutty it seems to me. On the flip side I refuse to rule anything in, so to speak.
Or to put it another way, if some force came down and had the truth and stated it for the world to hear (whether the Judea/Christian/Muslim God exists, whether multiple Gods exist, whether a different God exists, whether a God nobody has ever heard of exists, whether some spiritual otherworldly force exists, or whether no God exists) none of those results would shock me.