A few questions you could ask a JW who comes to call ...
1. If I decide to study with you and get baptised and become a JW, what will happen later if I change my mind and leave?
2. Can you be friends with a person of a different religion? If a close friend of yours, who is a JW, decided they didn't want to be a JW any more and wrote a letter to the elders and said so, would you still be their friend? Would you still talk to them? If not, would that be because you're scared of being expelled yourself?
3. I've heard that the Watchtower says Witnesses who write a letter of resignation from the religion are to be shunned. If the Bible says that Christians should shun people who are wicked, why do Jehovah's Witnesses shun people who simply want to leave their religion? If leaving a religion is so wicked that it warrants being shunned forever by your closest friends, why do JWs want everyone they call on to leave their religion?
4. How does your religion decide its doctrines? How does the Governing Body know what the anointed are thinking? If a person was one of the anointed (therefore of the FDS) and had a new thought about something, maybe decided that what they read in the magazines was incorrect, how does that get passed to the Governing Body, which actually makes the doctrines? Since the FDS is God's channel, does the fact that they had that thought meant that they got it from Jesus? What if 20 anointed had the same view? Or 200? Or 5000? At what point would the Governing Body decide they'd better change the doctrine?
5. If the Jehovah's Witnesses said you didn't have to go witnessing any more and turn in monthly reports, how much witnessing would you do? Would you be here today? If not, doesn't that mean you're only doing it out of fear of being looked down on by your elders?