Why don't some people understand lack of belief?

[Mister Agenda]

Because people who agree with the OP want everyone to think atheists are just people who go around blissfully ignorant of a fundamental question of human existence, i.e. "Does God exist?" It is question that demands an answer and how someone answers determines whether or not he or she is an atheist, theist, or agnostic. The possible answers are yes, no, and maybe. That's it. Everything else is just evasive puffery.

Seems like a gross mischaracterization of the OP. I've never met an atheist who is ignorant of the question or an atheist who thinks any significant number of adults are. You're making your bricks out of straw.

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So what is your answer to the question? And stating what label you think people should call you by is not the same as stating your answer? Man up and clearly state your position. Does God exist? Yes, no, maybe?

Does God exist? Probably not.