First, as you do research, look both on Google and also click 'groups' and go to the Google listserves. The listserves are discussion groups and you often find information there that you cant find on Google itself.
Note the types of discussion groups which yield the most information for you. That can give a clue what types of people are interested. I found the material on Humanity's Team on listserves catering to people interested in A Course In Miracles ( ACIM)
ACIM itself may not necessarily be a cult. But it attracts people who dont do background checks. The ACIM holy books that are supposedly advice from God or angels 'channelled' through psychically talented people.
A lot of people who are fed up with mainstream religion (persons who prefer mainstream religion are the ones called 'religionists' by the leader of Humanity's Team), gravitate toward these psychic groups. They form a recruitment pool which can be readily exploited by charismatic persons who operate outside of formal social networks.
The leader’s name is spelled Neale Donald Walsch
He may be referred to as ‘Neale Walsh’ or misspelled as ‘Neal’—keep all this in mind when using various combinations of search terms in Google. Other worried friends and parents may be asking for help, and they may post queries using ‘Neal’ instead of ‘Neale’.
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(A sample of HT’s ideology)
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It looks like Neal D Walsch is highly charismatic. I advise doing further research.
If at some point your nephew needs money, dont send it to him directly. Clothes and non refundable gift certificates are best. If he says he needs money for medical or dental care, arrange to pay the doctor or dentist directly, otherwise the money might go to the group not your nephew.
If he wants to go home, send someone to take him home. If you send money for a ticket, there's a chance he may change his mind or be persuaded to stay, and the money will go to the group not your nephew.
Most people in these groups do eventually leave, so dont despair.