Believes that God does not exist?
Well no more than I believe that the great snobblegarp of Beta Singula Prime does not exist.
Or not believe whatever that crap that the Hubbard worshippers believe.
Or in the sun god, or that the earth is hollow and elves walk upside down inside it.
You are using the limited self centered Christian definition of Atheist.
Some fools even try and make a religion of not believeing in a supreme being.
Not only do I not believe in God but any Supreme being. Any afterlife, etc.
I do not even believe in the Debbil.
Even though you are sure that he is guiding my actions
that poor mythical guy gets blamed with everything people do bad.
Most Christians sure seem to be poor observers of personal responsibility.