Absolutely

NO

But others were different, most of those have already left the cult. You have to keep in mind that the vast majority who ever received knowledge have left it shortly after that. So your circumstances must have been a bit different when you got sucked into it.
Yet another thing maybe, but this is, if you really want to do anything for him. You must learn to understand the cult better than he does.Not to throw it then into his face, but, you know he is/was to a certain point gullible to fall for that special mindset. That is a point. Maybe that part of a discussion should be better continued with private messages or other media..