Based on what you say next, I think, maybe, you meant, "no, but I'm going to change the subject".
EDIT: Oh, wait, I think I missed something about what you said.
Yes, as I noted in my response to
@Ovinomancer, that is an interesting, but different discussion. I accept that the assertion you made is a religious assertion (or could be, which is good enough).
But the distinction is important, as demonstrated by
@Morrus' post about his personal experience. In that instance the answer to the factual question was, apparently, decisive. In other instances, perhaps the family in the OP, perhaps not, the objection may not distinguish between actual occult practices and pretending. However, I still think it is critical to the discussion to be clear which kind of assertion one is addressing.
More EDIT: Your second assertion (bolded) is definitely (to me) a religious assertion because 'sin' is defined by religion. Your first assertion (underlined) is quite interesting because you might consider it equivalent to "Playing D&D increases the likelihood of becoming wiccan." However, I intended that assertion as something that was testable, in a statistical sense. But I can see that if you thought it meant the same thing as your first assertion, then you weren't changing the subject. Sorry.