I think you are mistaking my initial disdain with his decision to explore witchcraft. It isn't about believing in science, I don't think I mention science once in my post but I see how it can be mistaken since I mention I come from an academic background. I have no qualms with practicing witchcraft and actually would like to participate myself, all knowing that it is just for leisure and entertainment, and it isn't harmful. Similar to how playing a Ouija board might be. Others may believe there are actual beings controlling the position of the planchette, but we know that isn't true.
My initial issue was him using this newfound interest to fall into delusion and have more mental health issues by ignoring the reality around him. His biggest issue with my challenge of these beliefs came when I told him to talk to his therapist about this. I wasn't trying to force my beliefs on him because I don't have any beliefs regarding it, although that might've been what I did since a lack of belief is a belief itself. I've apologised and we're okay now, I hope. It does not seem like this is harmful so I'll be supportive of this, just as I've been supportive of his other personal troubles.