Hi Brother,You ask a large question, thats as vast as the individual numbers of Jehovahs (False) Witnesses that there are. Basically, they are like anyone else that is involved a religion of works. Depending on the depth of their involvment, will be the extent to which you can make an intellecutual arguement between the two philosophies. If your objective is to win a debate, there are a plethora of books on the market to teach you to do that. However, if your intent is to lead them to a saving knowledge of Jesus Christ, the person in question will read your life far better than anything you might present in the form of arguement. The Holy Spirit must do the convicting, and saving. Your job is to pour out the gospel, at the right time, from a clean vessel. PRAY BROTHER, PRAY!Clutch :-)