What you do in private is up to you. But when you're inviting members of your congregation to orgies in the congregation's compound, I think you earn the label. My admittedly third-hand understanding is that this is the dynamic people allude to. And even if you discredit the "sex" part, it has the hallmarks of a cult. A hermetic community committed to unfalsifiable beliefs about the coming apocalypse.

To be fair, I don't know if any of this applies to the parent story; I'm just replying to the sub-thread.