l-cool - If you tell a JW that he or she is in a cult and they asked you why do you say that? How would you respond?
It's probably best not to say anything that will put a Jobo on the defensive. The GB have successfully brainwashed them to retreat into cult ranks if they are told anything negative against their drunken leaders.
If you use scriptures, my guess is they'll see it as misuse of the bible no matter what it says in their own corrupt version.
If they want to escape the clutches of the Watchtower paedophile loving machine, they will.