Don't answer his question. He just wants an easy target and if you give him a list, he gets to choose which, if any, he addresses.
Make him explain why he is still a member when .... and then pick one question at a time and don't let him change the subject. Make him do the talking, the explaining, the reasoning. You shut up except to use questions to keep him honest and on topic. You can't reason his way out of the cult for him. He has to do it. Take control of the conversations and make him confront the issues he usually manages to avoid.