What does a person have to do to prove that they are not a theist?

And I proved it. @Cognostic refuses to prove that he and the rest of the good atheists have encountered my arguments previously. Why don’t you help him?

And he has failed to prove that there are multiple ways of “believing.” Again, why don’t you help him?

My definition of belief is “support of a doctrine.” Your definition of belief is a magical switch in the brain.