Ex charismatic case here:

As others have pointed out=> they have to figure it out, you can only help and wait it out.

They preach it themselves, be patient, show your life and wait. Same goes the other way.

The difference is that they are in a trap so to speak. They can’t back out because that triggers the fear of hell (it’s a one way street).

If they make it out it’ll probably be because their god has let them down for the millionth time on important issues. Be there for them in those moments and show them that life goes on outside of their bubble. And that life is good there. They’re in for a dark ride.

If it comes down to debating the matter: be careful. A good gotcha can feel like a small victory but it can also cut you out of their life. Or only embolden them to look up more fringe and whacky theories.

From my experience it’s probably more effective to dismiss such debates. Show them you care about them as a person and not their religion.

I dearly dearly wish you all the strength and love you can use. I hope they make it out.