Let me address directly the question of knowledge and doubt. Many Latter-day Saints (including many who have grown up in the church) are now re-examining their faith and are questioning whether or not they really believe the claims of the church to be true. In our information age we have a world of knowledge quite literally at our fingertips, and that has changed the landscape dramatically.
Many good Christians that consent to have conversations about the LDS church, express an opinion that goes something like this: "I'll hear what you have to say, but I'm going to test it all by the bible. The bible is the final authority. If it doesn't square with the bible, I won't believe it."
Note: This post was written a few years ago, prior to the Church publishing this essay on Race and Priesthood. I'm still keeping it up here, because I think there's some good things here. But suffice it to say, the landscape has changed somewhat..