"Suppose you are entirely correct. What then? Where will you go?"
Direct appeal to cognitive dissonance, followed by meaningless interrogative. They encourage you to hypothetically accept that you are right when you already know you are provably right. They push toward consonance in favor of your prior choices by sidestepping whether your proof is valid and trying to get you to reveal your future plans (which you probably have not formed yet) during a period of cognitive turmoil they created.
I'm going to spend a few minutes on this one, because it is from a big family of similar appeals.
The answer to the questions they pose only matters if you are actually entirely correct. If you are only supposedly entirely correct, there is no reason to even ask the question, "What then?"
The best answer I know of is, "I will figure that out once I know whether or not I am entirely correct. Can you show me that I am not entirely correct?" They have nowhere to go at that point but to attack your "pridefulness" or your "motive."
Here are others in the same family with similar recommended responses.
"Suppose this isn't Jehovah's Organization. Where will you go?" Answer: "If it isn't? Anywhere would be preferable according to Revelation 18:4-8."
"Suppose this isn't Jehovah's Organization. Which one is?" Answer: "If we are still living in the Great Apostasy, why would there have to be one?" (They HATE that response, they have no answer at all.)
"So, if this isn't God's Organization, how will you carry out the worldwide preaching work?" Answer: "Hm. I don't know. How was it carried out during the Great Apostasy?" (They HATE that response, they have no answer at all.)
"So if you don't believe X anymore, what do you believe?" Answer: "I believe all of my beliefs should be based on (the Bible/logic). Is that wrong? I also believe I don't have to necessarily tell everyone what I believe. You don't think I should tell everyone what I believe, do you?" (If they say it is wrong or that you should tell everyone, they are speaking in favor of apostasy, they cannot answer these questions directly.)
"How will you meet the requirement at Hebrews 10:24, 25?" Answer: "From the context, it seems to only apply to anointed ones. You don't think I'm anointed, do you?" (This made a Brother spit his mouthful of soda back into his glass. Other religions have feetwashers, we have backwashers, LOL!)
AuldSoul