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Kek
They got 'em sense of humor!
Hmmmm. That's a stretch. I know Christian parents who have had IVF. And I don't think that their kids are demon possessed. Or are they transgendering. But one thing that does bother them is that they take out several eggs and inseminate them and don't use all of them. Some stay frozen, in case the first batch doesn't take. And as far as these Christian parents are concerned, those inseminated eggs are babies with a soul already and if they are destroyed, it is like they were aborted.
I don't know how demon possession works.
But the Bible says to stay away from sorcery and witchcraft and to not let your mind be open to such things. So if a parent is exposing a young child to sorcery and witchcraft, then maybe the child can become demon possessed without really being the one who allowed it to happen. I think that is what that "moon baby" stuff is all about.