The most important thing is to get them out of the cult. Most are not. Many cults concentrate on good health. Inadequate or non-existent views of Christ, salvation and grace are common in the cults. Nor does cult involvement necessarily prevent them from finding Christ or relating to Him.
Cults rob a person of their own creativity and individuality.
Since higher education is discouraged once one joins a cult, the likelihood of obtaining a good paying job later in life is greatly diminished. Lasting friendships and important family ties have been neglected or have been destroyed over time. They have a persecution complex inherited from the cult, believing that all non-members are agents of Satan. They must be taught how to process the facts consistently, and before you can teach them, you need to gain their confidence and respect. Talk to former members of any group, as cult techniques are all quite similar.