I don't know if your a bible believer or not but I think that if your not blowing holes in The bible to help wake someone up is easier then blowing holes in thier cult. Many have said here over the years that attacking the cult doesn't do much good they have a defence for this and it kicks in when you say something. The bible on the other hand is a different matter. Their unprepared for an attack on it. They have always been taught that it gods book and nothing is wrong with it. As soon as you show them some things that are wrong in the book your destroying thier foundation thier cult is built on. In time the whole thing may come down and thier cult no longer had a leg to stand on.
This is a bit how I did it with my friend I would say things in rebuttal about how Jesus wouldn't do this or that when he complained about the elders or something but the rest of the time I would show a point in the bible to show how screwed up it is. Now he often says how stupid people are to live thier lives based on a book written 2000 years ago.