What Questions Should I Ask Someone Who Believes in a Higher Power?

Questions about what to ask someone who believes merely in a “higher power,” how to make a case for the existence of the afterlife, and whether or not we can use Revelation 22:18 as evidence that the Book of Mormon isn’t divinely inspired. What questions should I ask someone I’m working with to help him think beyond a belief in a “higher power”? How would you make a case for the existence of the afterlife, and is it necessary to use the Bible in order to do so? How would you respond to Mormons who objected to my using Revelation 22:18 to explain why I don’t think the Book of Mormon is divinely inspired?