Mormonism

 What is the Mormon's Testimony of the Spirit? 

http://mormon.org/faq/purpose-of-testimony  

A testimony is a spiritual witness given to an individual by the Holy Ghost. The foundation of a Mormon’s testimony is the knowledge that Heavenly Father lives and loves us; that Jesus Christ lives, that He is the Son of God (but not the second person of the Triune God), and that He carried out the infinite Atonement (Jesus died to make a way for everyone to save themselves by obedience to Mormon doctrine); that Joseph Smith is a prophet, which God called to restore Jesus Christ’s church to the earth; that we are led today by a living prophet; and that The Church of Jesus Christ of Latter-day Saints is the Savior’s (only) Church restored on the earth today.

Joseph Smith  "An American Prophets Record: The Diaries and Journals of Joseph Smith"

One of the grand fundamental principles of Mormonism is to receive truth. Let it come from where it may.

Or Not  

Because Mormons accept additional extra-Biblical and progressive revelation, they have a profoundly different teaching regarding the work and person of Jesus Christ; and a Jesus other than the Jesus of the Bible is no Savior.

2 Corinthians 11:4,13

...if someone comes to you and preaches a Jesus other than the Jesus we preached, or if you receive a different spirit from the one you received, or a different gospel for the one you accepted...such men are false apostles, deceitful workmen, masquerading as apostles of Christ.

Like these lies

"The Holy Bible" and "The Book of Mormon, Another Testament of Jesus Christ" are different histories, but the same gospel of Jesus Christ that He gave to separated Tribes of the House of Israel – Judah in Judea and Joseph in the Americas.

Jesus testifies of The Tribe of Joseph in the Americas - “The Holy Bible” John 10:16:

“And other sheep I have, which are not of this fold: them also I must bring, and they shall hear my voice; and there shall be one fold, and one shepherd.” 

“The Holy Bible” testifies of “The Book of Mormon, Another Testament of Jesus Christ” in:

Isaiah 29: Tribe of Joseph shall speak as a voice from the dust:

4. And thou shalt be brought down, and shalt speak out of the ground, and thy speech shall be low out of the dust, and thy voice shall be, as of one that hath a familiar spirit, out of the ground, and thy speech shall whisper out of the dust.

11. And the vision of all is become unto you as the words of a book that is sealed.

“The Book of Mormon, Another Testament of Jesus Christ” was buried in the ground to come forth in the last days, and 2/3 of it is still sealed until we prove to the Lord we can keep the commandments in the 1/3 He permitted to be translated by His Prophet Joseph Smith; therefore God took the plates. 

It wouldn’t be necessary for God to send another angel to the earth in the last days “having the everlasting gospel to preach unto them that dwell on the earth, and to every nation, and kindred, and tongue, and people” if God's true Church had been on the earth since Christ lived in the flesh in Judea. This prophesy was fulfilled when Jesus sent the Angel Moroni to His Prophet, Joseph Smith, to show him where the plates of The Book of Mormon were buried so Joseph could translate them by the gift and power of God. Moroni was the Prophet Mormon’s son in life. He finished his father’s abridgement of the record of the Tribe of Joseph in the Americas, which contains the gospel of Jesus Christ as well, then buried them to come forth in the last days to prove “The Holy Bible” is the word of God. 

“Wherefore, I the Lord, knowing the calamity which should come upon the inhabitants of the earth, called upon my servant Joseph Smith, Jun., and spake unto him from heaven, and gave him commandments; and also gave commandments to others, that they should proclaim these things unto the world; and all this that it might be fulfilled, which was written by the prophets — And after having received the record of the Tribe of Joseph, yea, even my servant Joseph Smith, Jun., might have power to translate through the mercy of God, by the power of God, the Book of Mormon...

What I the Lord have spoken, I have spoken, and I excuse not myself; and though the heavens and the earth pass away, my word shall not pass away, but shall all be fulfilled, whether by mine own voice or by the voice of my servants, it is the same. For behold, and lo, the Lord is God, and the Spirit beareth record, and the record is true, and the truth abideth forever and ever. Amen.”

Mormonism and America

https://mormonbible.org/book-of-mormon/what-the-book-of-mormon-says-about-prophets/what-the-book-of-mormon-says-about-america  

Rescue of the Constitution   

https://www.churchofjesuschrist.org/study/ensign/1976/06/i-have-a-question/did-joseph-smith-say-that-the-constitution-would-hang-by-a-thread-and-that-the-elders-would-save-it?lang=eng