Have you ever seen a website like this one? Basically, it revolves around people roleplaying as certain characters, and there are plenty of characters for you to choose from.
She is showing a common attitude of distrust for "anti-mormon" material. If you try to deconvert her I suggest indirectly at first.
These are things your wife may consider matter-of-fact and you may be surprised by if you don't discuss them now. Finally, it is a very tight-knit community and despite efforts to insulate you from conversion-minded missionaries, you will be exposed to a lot of people that think, like this woman does, that atheists are without a moral compass.
My parents met when my mom was in 8th grade and married when she was I think my sister married fastest and knew her husband at least 18 months, dating for at least half that.