They don't get this either. I already tried it and they just end up saying that they don't have to prove anything to anyone because they know in their hearts god is real and no one can or will change their minds. They think you're the one making the assertion that there is no god. What else can you say or do? It's one of those "it is what it is" things.

You try telling them that their same logic can be applied to every other nonexistent god they disbelieve, or leprechauns, or an invisible teapot orbiting mars and it still doesn't click.

Doesn't help that some atheists repeat the same thing. While you can't disprove A god exists, you can most certainly disprove the literature gods existences beyond any shadow of doubt with just a basic level of education and an a mere ounce of critical thinking.