<human>: I don't know how to approach this or if I should approach it at all.

**My friend ("Alan") has apparently been involved with a conspiracy nut for as long as I've known him (better part of a decade)**.  Alan has done research for this man ("John") and contributed to his website.  John is a fringe evangelical type who believes in secret societies that control the world, ultimately to pave the way for the Antichrist.  It's kind of like the Da Vinci Code, but way more involved.  Plus Satan.

I always knew that Alan was religious, but I didn't realize he believed in all this.

**Alan has recently become more publicly vocal about some of his controversial beliefs, has made a bunch of new friends who seem to share his viewpoint, and has distanced himself from some of his older friends** (granted, he apparently was following this John when we all started being friends).

I'm really concerned about Alan's mental well-being and that John will (or has already) scam Alan out of money.

Does reddit have any advice about how I should handle the situation?  I just want to go up to him and tell him he's out of his mind.  But I have tried logically arguing with him at length about specific issues (fake example, arguing why Harry Potter is not Satanic - things of that nature) and not gotten anywhere.  I think he is well beyond a logical explanation of why the kind of vast conspiracies he believes in aren't even feasible in the real world.

Summarize the given text in a few sentences.
<bot>: My friend has been following a crazy conspiracy theorist/religious leader, and I am afraid that he is losing himself to it. What should I do?