I would go ahead and make boundaries with the conversation about kids and church, if that is your preference. Am I a homewrecker. If she identifies as a Mormon, then she probably takes her faith seriously, and it means a lot to her.
And even then it will put Huge stress on it and on you for the rest of your life.
You'll take out the trash, coordinate all ho home repairs, pay all the bills, do all the yard work and generally work your ass off until you're emotionally and physically drained.