I think I'd just lay it all out on the table for her and see how the chips fall. She will then have the choice of you or the cult and the decision may be made for you.
my thoughts exactly.
i married my 3rd generation born in wife when i was 20. i decided i'd had enough religion by the time i was 23. the marriage lingered for another 10 years and produced 3 kids. i then--stupidly--got involved in an affaire and wifey divorced me " on scriptural grounds" almost before my feet were back on the ground. she had wanted out of the marriage for years !.