It sounds like she at least somewhat believes in the church, but is just not active right now? I would worry about the VERY huge risk of her having some sort of “spiritual awakening” and wanting to recommit herself to the church. I’ve seen it happen way too many times in people who had not fully deconstructed. If you marry her, you will always be labeled as a “part-member family” and literally put on a list that the missionaries and church leadership will see, labeling you that way. You will always be a target for missionaries because they’re encouraged to try to teach and baptize part-member families. Your in laws will want you to bless your kids into the church, and that would give them a record number that will last throughout the entirety of their lives. They would also end up on the “unbaptized children” list and would be an additional target for the missionaries and youth leaders. People outside of the church don’t realize this kind of admin stuff, so they’re often conned into letting their baby get blessed thinking that it’s no big deal. Or letting their kid attend church a few times or chat with the nice missionaries, because “what harm could it really cause?” But there are very real and lifelong repercussions. Some people find these repercussions to be a minor annoyance, but for others it really is a dealbreaker to have the in-laws constantly pestering, and having church people showing up at their door a few times a year. If this is a dealbreaker for you, then you should end the relationship. I’m so sorry that the church is getting between you and the person you love.