...of, "Fuck off, I am an atheist," Do Mormon missionaries not understand?
It's not that they don't understand.
They are trained to ignore abuse and to try to persuade you to "believe".
They see you as a soul to be saved and that is their route to heaven.
Seemples when you understand where they are coming from.
Best answer is to shut the door in their faces and say nothing, engaging in conversation, even to say "Fuck off, I am an atheist
," is, in their minds, inviting them to debate the matter with you.
BTW ..... Surely that comma should come after the quotation marks