Ok, but do you think that if they did - you could disprove liberalism by applying it to rocks?
lol, no. I am not trying to disprove atheism. Nor, are others here doing so. What they have done, however, is show why using the definition "not theist" is not a good definition for atheism.
Even proponents of such a definition only claim implicit atheists on a "technicality" a technicality based off of begging the question, but a technicality nonetheless.
Not one has offered how such a definition adds anything but semantic play to the discussion. And, when we get to the heart of the matter (people want to say "I was born atheist and nothing changed), we find a nest of equivocation.
Atheism does not need bad arguments because we have good arguments. As you pointed out there are no perfect definitions, but this doesn't mean we should use a less correct definition, because they are all flawed. Such would only be true if they were equally flawed. And they are not.
The people who bring up babies and rocks do so only because the definition of implicit atheist allows for such. Want that to stop, then do not use a definition that allows it.
And while I understand that definitions are "flawed" we must rely upon definition to have a discussion. And if we are going to rely on definitions should not we rely on the better definition?