"A few years ago a member of the Committee of the Atheist Foundation of Australia proposed a new definition of 'atheism' that removes any hint of negativity and puts the onus of justification right back where it should be - that is, on Christians. His definition is 'Atheism' is the acceptance that there is no credible, scientific or factually reliable evidence for the existence of a God, god/s or the supernatural'. This was accepted as our official definition, though personally I would prefer the removal of the word 'credible' because of its association with 'faith' and 'belief'. It could well be replaced by 'logical'."
http://www.atheistfoundation.org.au/belief.htm

Atheism is a belief. All they doing is attempting to do is relabeled themselves. They are about as scientific as Creationists.