Religious cult recovery is quite different from addiction. Be careful and don 't try to morph the 12 steps. Don't say that your people must declare that they are/were helpless to the cult and came to believe a higher power can give them strength or guidance.
Stick with just allowing people to say they were affected by a group or set of beliefs and desire to share with others like them. Tolerate no bullying of any current beliefs within your group, from atheism to non-Christian beliefs.