I like to ask this question. Have him read this verse: (Proverbs 21:18) 18 The wicked is a ransom for the righteous one; and the one dealing treacherously takes the place of the upright ones.
Then ask him if Jesus was our ransomer and how can that be when he was not wicked? The bible says that the "wicked" is a ransom for the righteous one.
It actually means that the wicked must pay the price of thier death in order to ransom the righteous one from their evil influence. He probably wont know that. Might though. If he gives you that answer, then ask him. Does that mean that all the wicked will have to die for us to have a paradise earth? (He will be excited that you got the point, yuck.) He will have to say yes. Ask who constitute wicked people. When he says those not doing God's will, say... "like me and my family?" He will hedge and hem and haw. Then you can add, that means that nearly 6 billion people will have to die for you to have peace? That means my neighbors and your neighbors? All these people will be killed by God?
He'll give you the whole preach before the end crap. Just say that the latest tract will only reach 350 million of these people. How is that a good enough warning for 6 billion people? The end must be far off it the good news is to be "preached to all the nations and then the end will come." If he says that not everyone has to hear it because God judges hearts, you can say, well that means they don't have to be Jehovah's witnesses to be saved after all. Isn't that what all the churches teach too, that God is the judge and it doesn't matter if you go to church so long as God views you as acceptable?
Let the sparks fly!!!
Have fun.
W.Once