So my S.O. just informed me she may be joining a fundy church

[Warpy]

18. You don't want to make her defensive, so no more confrontations, they don't work.

If she's feeling the need for community, you might explore whether she's open to going to a UU church or something more mainstream like the Anglicans with you instead of a fundagelical cult without you. Right now, the AOG people are love bombing her, so it's going to be a tough choice, respect that.

If not, recognize how seductive this shit can be. You might have the choice of either forcing her to leave or watching her just slip away. These people know what they're doing, they don't get people on the soundness of their theology or on compassion or anything else good, they love bomb them and suck them right in.

I won't tell you there is no hope, a cousin's daughter and SIL got sucked into a prosperity theology megachurch in the 00s. It took them about six months or so to notice the only prosperity that was happening was happening to the preacher, who was living large on tithes of family gross (not net) incomes. Sometimes people realize the funny equations just don't add up. It's pretty rare, though.

FWIW, I've known people in the AOG who were fine to deal with, although definitely not people I'd want for SOs. While individuals can be assholes, that's true of any group you can name. They're certainly far from the worst fundies out there. I'd be tempted to give it some time, letting her explore. I'd also be figuring out how best to divvy up the assets if worst came to worst, but that's just me.