JW's are told the best way to make people think is to ask questions. So personally I would take a similar approach to one mentioned earlier. I would ask, "Do YOU believe that only the FDS is the channel that can provide truth and spiritual direction to God's people?" Naturally they would say, "Yes." Then I would ask, "So, spiritual direction from any source OTHER than the FDS would be suspect, and therefore NOT the real truth?" Of course they would have to answer, "Yes." Then I would ask, "What would be the result if a person, or group of people were to follow spiritual instructions and Bible interpretations that were promoted by another person, or group of people who were not the FDS?" We all know how that question would be answered! My final question would be then, "So what about the religious, spiritual beliefs that are based upon, have been expanded on, and re-interpreted that were from CTR's beliefs of the Bible, considering that according to the FDS he was not part of the FDS, and therefore could not have been God's channel of communication, according to your own answers?"
Any other conversation related to THE QUESTION would be met with either silence, or my assertion that I in fact place my convictions on Almighty God, Jesus Christ, and the Bible. (Acts 5: 29)