Without looking it up, I have to think these definitions are wrong. Common usage is atheism denotes belief in the non-existence of God and agnostic denotes lack of belief or uncertainty. Whatever the definitons, that's the common usage and it won't change.hypnagogue said:The word "atheism" just denotes a lack of belief in the existence of a god or gods. Questions about evidence are perhaps relevant to whether one chooses to be an atheist or not, but they are not built into the definition of the term itself.
Note also that being an atheist does not entail actively denying the existence of a god; one can be an atheist without holding the positive belief that god(s) do not exist. For more information, see the Wikipedia entry on atheism.