I am an Evangelical Christian. If a non-Christian were to say to me something about "The Immaculate Conception", I think it would be a tad disingenuous to just

I am an Evangelical Christian. If a non-Christian were to say to me something about "The Immaculate Conception", I think it would be a tad disingenuous to just say, "We don't believe in any Immaculate Conception!" It would be more forthcoming to say, "Well, the doctrine of the Immaculate Conception is a Roman Catholic doctrine that asserts that Mary was born without sin; we Evangelicals don't believe that. We do, however, believe that Jesus Christ was born without sin." Likewise, I think you would be more forthcoming in admitting that while LDS does not believe there are any "mystical properties" ascribed to the plates, there were indeed "mystical properties" ascribed to the glasses, the Urim and Thummim, used by Joseph Smith to translate them.