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Teddio, I think you're probably right in that some people of religion consider atheists to be heathen. Strictly speaking they'd be wrong though because whilst heathens do not believe in the God of Abraham, they often believe in other gods or practices. Atheists on the other hand, have no faith whatsoever.
DT, I think your angle on this is detracting from the question, so we'll have to agree to disagree. Faith in oneself can hardly be described as a religion - and religion is what we're talking about. The point is I haven't asked for opinions on the various definitions of the word 'faith', but on what people who consider atheism to be a faith, the God Delusion to be a bible, and Richard Dawkins to be a priest, imagine atheists have faith in. Nevertheless, I thank you very much for your input.