This is really pretty simple: in the history of the world, new things and new facts are discovered over time of which we had no knowledge or understanding previously.
Oh, I agree, and at that point there would be evidence to support such understanding.
This "attacking" is not limited to atheism. As qazplm rightly said, everyone believes something that makes them feel better but which may not be true. For most people, you can simply point to their religion which is almost certainly flawed in some way, even up to the point that there may not be a God/god. For others, it may be that their obesity is caused by a thyroid issue and not the fact that they can't stop eating Cheetos and drinking 2L of Coke. For others, it may be that they are "the man" with the ladies... in Attica. For still others, it might be that they are intelligent when the reality may be that they've just surrounded themselves with relative idiots.
The idea that what someone contends may not be true is always a possibility. I study climate change, and all available evidence points to greenhouse gases as the dominant cause for global warming. Someone else may contend that there is a dragon outside of the realm of our comprehension that is blowing invisible fire into the climate system. If that person, or group of persons, can make the dragon visible, collect some poo, or convince the dragon to fly down and build a nest on Mt. Rainier, I would be forced to re-think my original claim. If someone believes something without verifiable evidence, there is no reason to take that belief seriously.
Point is, everyone thinks and believes something which makes them feel better. No one is perfectly self-aware nor omniscient. Only someone of supreme arrogance would believe they understand everything possible in the universe, and that anything that they don't know or can't currently fathom thus must not exist.
Is this a distortion? Nobody has said that concepts we don't understand must not exist, have they?
The crux of the argument is that as a rather aggressive atheist (at least as portrayed in this thread), ecouch (and you?) not only do not believe in God/god, he does not recognize nor acknowledge why many people do, and in fact disparages such beliefs. The irony is that his "blind spot" may actually be the fact that he - like everyone - has blind spots.
I think ecouch recognizes why many people do believe in a supernatural being, he just thinks that belief in God/religion receives unwarranted special respect in the public sphere. If a belief does not have verifiable supporting evidence, it should be fair game. As a result they are open to as much ridicule as Dr Oz when he claims to have found "magic" coffee beans or Bill Maher when he claims the flu vaccine causes brain damage.