Ex-cult member here.

The only thing that snaps someone out of that spiral is an internal realization. There’s nothing we as outsiders can really do directly. Engaging with their version of reality (Christian evangelicals specifically) feeds into the prosecution complex and perpetual victimhood that validates their position. It’s a self-defeating tactic to confront them directly.

Focus on positive, normal, consistent interactions. Share your regular, everyday triumphs. If your lifestyle comes up in conversation, express being satisfied with it. Decline going to church with them. Don’t debate their stances on doctrine if you share a root faith.

And above all, unless they are actively abusing you, don’t abandon them. That’ll seal them in and you’ll never get them back.