Sincerely. The alleged quotation does make no sense, and it's nice to see the demonstration of the lack of credibility on the part of those claiming its existence.
It would make as much sense for him to have said An atheist is someone who knows there is no god. By some definitions atheism is very stupid as it would for Gloria Steinem to have said A feminist is someone who hates men. By some definitions feminism is very stupid.
An atheist does not believe (in a god or gods), by the actual definition.
I'm an atheist, and also an agnostic, on the issue -- and I don't see that as a cop-out, just as recognition of the limitations of the data available to me and of my inherent human abilities, and of course the fact that there are gazillions of things I don't know. Being an agnostic doesn't really mean admitting that one thinks that what one believes in this instance might well not be true. But for all I know, there might really be faeries at the bottom of my garden ...
If only theists (those who don't acknowedge it) would acknowledge that they're agnostics too, the world might improve. 
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