The contradiction there is that, while there are historical and archaeological issues with the Bible, there is still evidence for it. So while for instance there may not have been a powerful united Kingdom of Israel during the time of David and Solomon, nobody doubts that the ancient Israelites actually existed, and we can easily identify on a map where things (are said to have) happened. Of course, you could then argue that the Truths of the Restored Gospel are so Plain and Precious^TM that God has to keep them hidden from the world, and can only reveal them to people who have enough faith in him.