Fighting the cult by definitions: In principle yes, in practice no. No matter how irrefutable your definition is, you can't force people to adopt it. Religion isn't a natural phenomenon that can be clearly described and neatly captured in a watertight definition. The concept of religion is by it's nature wishy washy, and you'll probably not find two authorities who fully agree. Xenu: LOL Xenu is a valuable and very effective mean of inoculation. It will however not give os much inroad here, as the Xenu story is among the most real religion-like aspect of the whole cult.