If a JW asks me "-Do you believe in God?" and I answer "-No, I dont believe in God" he/she assumes that I´m not interested. And that´s because of a total closed mind. If someone ask question "A" he should also ask question "B" if the first answer is "No".
The second question should obviously be in style of: "-Do you believe that God does not exist?" If the answer is "yes" we have a situation where TWO believers are talking to each other. (One who believe in God and the other who believe the opposite)
But if the answer is "No"....it´s something they cannot think of! But if someone is open minded (open for that God may or may not exist) that´s how the answer will be, and it requires two questions to figure that out. That´s why the "do you believe....?"-question is absurd.