Khandro, of course it’s crackpot. It disagrees with you. ;o)
‘Atheism from the Greek ‘a’ – without, ‘theos’ – god’. (That is actually what the word means – without god – and that in no way implies rejection – it is simply ‘without god’).
How about the University of Cambridge? Is that any good to you? From here:
http://www.investigatingatheism.info/definition.html
‘Atheism is a complex term to define, and many definitions fail to capture the range of positions an atheist can hold………. More recently, atheists have argued that atheism only denotes a lack of theistic belief, rather than the active denial or claims of certainty it is often associated with.’
I would say that coming from the position of atheism, an atheist is far more likely to have a rather more comprehensive understanding of the term than the narrow one you prefer to promulgate. Argue all you like – you can’t change it.