Happy new moon!
She likely believes that her time as a missionary was preparation for marriage. When she had a strict 6: If there was a disagreement, one person was supposed to submit to the other, consult a rulebook that covered almost everything, or turn to a church leader to decide for them.
All you have to do is be honest about your username here and you'll never see her again. There's no way a TBM is dating you if she knows about your Lucifer kick.
Take your date to a club with loud music and an open bar, or an R-rated or violent movie, and the prospects of it going well are daunting. Well, maybe not a total disaster, that is a bit exaggerated.
Because you are a good person, you will recognize the influence of the Holy Ghost and know that the church is true.
Your attempts at being funny or lightening the mood may backfire, and your date may be put off.