I don't think that you can... How can you claim to disbelieve in something, that you've already acknowledged, by claiming that you don't believe in it?
It doesn't make any sense. God has to exist, at least as an abstract concept, in order for you to have developed your opinion about it...
More importantly, who do you think gives a ***?
There are seven and a half billion *** running around on this stupid rock, the idea that it matters what any one of them believes or disbelieves at any given point in time is completely absurd.
If it does, well then
I don't believe that atheists exist...ok? there you go...how's that?... put that in your pipe and smoke it.
or better yet... since I just finished establishing that it isn't possible to not believe in something that you've already identified, atheists have to exist, like god, as at least an abstract idea.
BUT YOU CAN'T BE ONE! because it isn't possible to not believe in something you have already recognized.
So the only way to actually be an atheist would be those people that had no concept of god at all and therefore have no opinion whatsoever. Only then could they actually not believe... but only because they weren't familiar with the concept.
So unless you develop total amnesia you'll never achieve your goal of becoming an atheist and your entire life is an even bigger waste of time than everyone else already thought it was. And even if you did become an atheist, you would never know it and never be able to tell anyone else.
so stfu.
The End