Why do you lack the experience of 99% of humankind, do you think?
Yes. I think. That is why I'm an atheist.
Like millions of others, I have learned to critically evaluate claims, including god claims. I have learned the power of skepticism, reason, and empiricism, and have the justified belief that they will lead me to properly understanding my world and to making good decisions more frequently while navigating it.
You have it backward. It's the majority - the believers - who lack the experience necessary to not believe. They lack the education and other cultural support necessary to choose atheism.
Incidentally, the world is not 99% theistic.
And those that are theistic contradict one another, which tells us that if they aren't all wrong, at least most of them are.
If you like to use numbers to imply correctness, recall that most of the world rejects the Christian god just as most of it rejects the Muslim god and every other god.