Many people would disagree that atheism is the null hypothesis... and in those circles people honestly believe they've been personally contacted by God.
In this case, "there are no gods" is still the null hypothesis, but (from the perspective of those people) it has been falsified by overwhelming evidence. Some kind of overwhelming evidence coming directly from a deity would convince me, as well; but, so far, I haven't see any (which is why I haven't mentioned it in my post, above).
Many won't even accept that there is a possibility, and I think this is just as dangerous as blind faith.
I can't speak for other atheists, but I personally think that it is entirely possible that certain gods exist. For example, I see no reason why the Trimurti (Brahma/Vishnu/Shiva) could not exist in some way. Of course, the probability of their existence is so vanishingly small that it's not worth thinking about, but still, it's possible.
I appreciate that you try to keep the possibility open, but I think it's kind of silly to say that there is a possibility, just a vanishingly small one. Mathematically, there's no sense in saying that an infinitesmal is actually any greater than 0 expect for technical reasons—so perhaps you technically believe that the Trimurti could exist, but for all intents and purposes the probability is 0.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.