Whenever angelic announcements were made here on earth Gabriel was most often the angel of choice. In Islam Gabriel is the Angel who relayed the Qur'an to Muhammad from God. So, if such doctrine is true, at least it came from Gabriel, an angel known to give such tidings.
But who is this Moroni? No such name as Moroni in scripture. According to Latter Day Saint belief, the golden plates are the source from which Joseph Smith translated the Book of Mormon, a sacred text of the faith. Some witnesses described the plates as weighing 50 pounds, golden in color, and being composed of thin metallic pages engraved on both sides and bound with three D-shaped rings.
Smith said he found the plates at a hill near his home in Manchester, New York, after the angel Moroni directed him to a buried stone box. Smith said the angel prevented him from taking the plates, but instructed him to return to the same location. Though he allowed others to heft the box, he said that the angel had forbidden him to show the plates to anyone until they had been translated from their original "reformed Egyptian" language. Smith dictated the text of the Book of Mormon, claiming that it was a translation of the plates. He did this by using a seer stone, which he placed in the bottom of a hat and then placed the hat over his face to view the words written within the stone. Smith published the translation in 1830 as the Book of Mormon (
bits and pieced from https://en.wikipedia.org/wiki/Golden_plates) .
If these plates were in Manchestor NY, I would think that someone would have found them by now.
So this so called book of Mormon was translated from the original "reformed Egyptian" language, which much of the text looks like it was copied from the KJV of the bible. And I would imagine such revelation coming from the Jew, or at least a son of Shem, as the scripture says...
1 What advantage then hath the Jew? or what profit is there of circumcision?
2 Much every way: chiefly, because that unto them were committed the oracles of God. - Romans 3:1-3
The Apostle Paul had trouble with people manipulating the scripture in error. At one time he declared...
6 I marvel that ye are so soon removed from him that called you into the grace of Christ unto another gospel:
7 Which is not another; but there be some that trouble you, and would pervert the gospel of Christ.
8
But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.
9 As we said before, so say I now again, if any man preach any other gospel unto you than that ye have received, let him be accursed. - Galatians 1
And the Apostle Peter, taking up with Paul, said that...
14 Wherefore, beloved, seeing that ye look for such things, be diligent that ye may be found of him in peace, without spot, and blameless.
15 And account that the longsuffering of our Lord is salvation; even as our beloved brother Paul also according to the wisdom given unto him hath written unto you;
16
As also in all his epistles, speaking in them of these things; in which are some things hard to be understood, which they that are unlearned and unstable wrest, as they do also the other scriptures, unto their own destruction.
17 Ye therefore, beloved, seeing ye know these things before, beware lest ye also, being led away with the error of the wicked, fall from your own stedfastness. - 2 Peter 3
I personally believe that the Book of Mormon is, as the Apostle Peter says, a product of the unlearned and unstable, which they wrest, as they do with other scriptures, unto their own destruction. And I personally believe that the angel Moroni is, as the Apostle Paul said, an accursed angel as he brought another gospel which was not handed down through the Apostles.
