Wasn't sure what Real Love is, until I found this:
Seems to me like a business, selling expensive "entertainment" services. It may help if you can provide more background.
Is your friend spending too much of money for seminars/coaches ?
1. Learn and understand (without judging) what this "cult" means for your friend and in what ways is he getting involved with them. Ask him to share with you what he is learning/experiencing from this group.
2. Talking about judging, try for yourself to develop an objective/non-partial view about the situation.
It's tempting to generalize about a situation being all bad, but there are always some benefits, some good that goes with the bad. Also, you can't tell with certainty there will be a bad result, the future is a funny thing, sometimes surprises us.
But ultimately, you will need to be honest.Try to establish a climate where you can accept eachother oppinions, while sharing your worries about the situation.
3. Encourage your friend to grow, be proactive, put into practice what he has learned, in his own life, relationships, share with others (maybe doing charity work).
4. I wouldn't push any help upon him, unless he asks for it. You can try to involve another friend, if there is a person that's mature emotionally and that your friend harbors respect for.
Only you can decide how much effort you are willing/able to invest in helping your friend.
Accept that ultimately you cannot control his decisions.