Here is the final collection of refutes of this popular challenge by Hugh Nibley, from this site, with commentary and additional reference links added.
21. Your record is to fulfil many Bible prophecies, even in the exact manner in which it shall come forth, to whom delivered, its purposes, and its accomplishments.
Since Biblical prophecy is an inexact science, to put it mildly, it is a fairly simple matter to find a Bible verse that can be re-interpreted to fit your own conclusions. The Muslims have found Bible prophecies of Mohammed; the Baha’is have found Bible prophecies of Baha’u'llah. The list is endless.
22. Call down an angel from heaven in the middle of the day and have him bear testimony to four honest, dignified citizens of your community that the record is the word of God. These witnesses must bear the angel’s testimony to the world, not for profit or gain, but under great sacrifice and severe persecution, even to their death beds. You must put that testimony to the test by becoming an enemy to these men.
Firstly, what we have here is secondhand information, at best. We have no way of knowing whether these men actually saw the angel, or if they were simply mistaken, or if they were dishonest.
Secondly, the Book of Mormon is by no means the only book to contain such a testimony. A former follower of Smith, James Strang, founded his own breakaway sect of Mormonism after the death of Joseph, and produced his own ‘translation’ of the brass plates of Laban, known as The Book of the Law of the Lord. This book includes a testimony of seven witnesses, to the effect that they saw and handled the plates from which the book was translated. Following the logic of the LDS church regarding the power of such a testimony, they should have canonized The Book of the Law of the Lord a long time ago.
23. Thousands of great men, intellectual giants, national and international personalities, and scholars for 125 years must accept your history and its teachings even to the point of laying down their life rather than deny their testimony of it.
Again, this is true of a great many sects and faiths. The followers of Baha’u'llah, known as the Baha’is, were mercilessly persecuted by the Muslim majority in Persia about the turn of the century. The sect still thrives today, with several million members worldwide, and despite the fact that persecution still continues in Muslim countries such as Iran.
24. You must include within the record this promise: "And when ye shall receive these things, I would exhort you that ye would ask God the Eternal Father, in the name of Christ, if these are not true; and if ye shall ask with a sincere heart, with real intent, having faith in Christ, He will manifest the truth of it unto you by the power of the Holy Ghost."
How difficult is it to include such a promise in a text?
25. Missionaries must bear record to the world for the next 125 years that they know the record to be true because they put the promise to the test and found it to be true. The truth of it was manifested to them by the power of the Holy Ghost.
26. Over 50,000 plus competent salesman must be so sold on your book that they gladly give up two or more years of their lives to take it to all parts of the world for distribution. They not only pay their own way during these years, but return bearing testimony that the time spent will remain as one of the highlights of their lives. They receive nothing in return for their efforts but the joy of having shared your book with others.
27. Your book must not only raise the standards of millions of people but do it in such a way that they become one of the great moral, ethical, and dynamic marvels of the day. They must become world renowned for this.
Once more, the missionary effort of the LDS church is by no means unique. Believers of all stripes and shapes feel compelled to share their faith, often at great personal cost. One is often reminded of the poor Jehovah’s Witnesses, who faithfully pound the sidewalks every day, often greeted with nothing more than a slammed door or a harsh word.
As for the Book of Mormon raising the moral standard of its followers, this too is not unique to Mormonism. The whole point of religion is to exhort mankind to live a better life.
28. For the next 20 years you must watch those that follow and you, your family, and the dearest of your loved ones
persecuted, driven time after time from their homes, beaten, tortured, starved, frozen and killed. Tens of thousands must undergo the most extreme hardships in your presence just because they believe you claims concerning the origin and content of what you have written on ancient Tibet.
This is a repetition of point 23.
29. You must gain no wealth from your work, but many time lose all that you have. Like those that believe you, you must submit yourself to the most vile persecution. And finally after 20 years of this, give your own life in a very savage and brutal manner, for your testimony concerning your history book. This must be done willingly on your part.
There are other rewards beside monetary. Joseph Smith may have suffered financially, but he posessed that which all people crave – power, and the blind respect and admiration of his followers. Many would gladly suffer personal hardship in order to gain such a following.
30. Start right now and produce this record which covers 2600 years of history, doing it, not in the peaceful
atmosphere of your community, but under the most trying of circumstances which include being driven from your home several
times, and receiving constant threats upon your life. Please have your book completed, talk a friend into mortgaging his farm to
raise money to have it printed – all in 60 days.
The claim that the Book of Mormon was completed in sixty days is not the whole story. The actual dictation lasted from April 7, 1829 to early in July – some eighty days, give or take. However, this does not mean that Smith only had those eighty days in which to think about the narrative. He had actually begun the task more than a year earlier, first with Emma Smith, and then with Martin Harris as scribe. The result was 116 pages of the Book of Mormon, all of which were subsequently lost when Martin Harris was allowed to take the pages home to show his disbelieving family. The point is that there was nothing to stop Smith from at least thinking about the Book of Mormon story in that inbetween year. He may even have made some notes.
Conclusion
As we have seen, a number of these points are completely irrelevant to the historicity of the Book of Mormon, others are easily duplicated by other works of fiction, and still other points do not apply to the Book of Mormon, such as archeological accuracy. We therefore find no compelling reason to suspect that the Book of Mormon had a supernatural origin: instead we find that it fits very well with the more mundane theory – that the Book originated solely in the mind of Joseph Smith.