I have little interest in discussing fantasy as though it were reality, and I don't think it's appropriate for or relevant to LW.
This perspective is classically biased, I'm afraid to say. :/ I agree with you (now, given other's comments) that it may not be an appropriate conversation to ask LW to host.... but if you write off the possibility of its veracity as "fantasy" before studying the material, you are exhibiting a preconceived notion independent of the data. It's like when Einstein wrote off quantum mechanics as "too weird".
In this comment thread, I gave the following idea, on the topic of a method by which one might judge the Book of Mormon from a rationalist perspective:
I would appreciate feedback on this idea, for an admittedly selfish reason: I am trying to instigate in myself a Crisis of Faith. So, here are the questions I pose to you: