About a good 50% of everyone's beliefs are delusional

And what good percentage of everyone's utterances are confidently presented as if they were self-evident truths... and without a shred of evidence? Must try it. It also allows you the advantage of appearing to take the moral high ground without actually doing anything to get there.

Little Hawk, are you offering lessons in this technique?

Meanwhile, back amongst the sinners, I would put it to you that the various belief systems at the hearts of our many religions and variants of religions are not so much delusional as contested.

As for the woman in the article, the only thing we can categorically say at present is that she was not right on some level. Whether this was due to the cult she was in or pre-existing issues or something entirely different, none of us here can say. It's a profoundly horrible story. Not one you'd want to remedy by demanding further blood is shed, though.