Atheists love to tell you that nobody believes in God until "some wacko" tells that person about God.
Well, if a person had never heard about God, and you mentioned God to that person, what would that person say in response?
Probably something like "Who's God?" Guess what? That's what you call an "agnostic".
I contend nobody is born an atheist, either, until somebody tells them that God doesn't exist.
Being ignorant doesn't automatically make somebody an atheist. But it helps.