So, back to the OP:
I don't understand why the Gospel of Jesus Christ needed to be "restored". Will someone please explain why God Himself, Jesus Christ, was unwilliing or unable to care for,preserve, and maintain His Church, for so many years that She needed to be restored.
Joseph Smith claimed to have restored Christ's Church. Here are some other things that Joseph Smith said:
I have more to boast of than ever any man had. I am the only man that has ever been able to keep a whole church together since the days of Adam. A large majority of the whole have stood by me. Neither Paul, John, Peter, nor Jesus ever did it. I boast that no man ever did such a work as I. The followers of Jesus ran away from Him; but the Latter-day Saints never ran away from me yet.
(History of the Church, vol. 6, p. 408-409).
After convincing his followers that there had been a complete apostasy, Joseph Smith, Jr. cast doubt on the Bible (see the Book of Mormon, 1 Nephi 13:24-29).
On October 3, 1918, President Joseph F. Smith declared that the Church of Jesus Christ of Latter-day Saints will never fail. The LDS voted to make his statements scripture(see D&C 138).
We now live in a time when the gospel of Jesus Christ has been restored.
But unlike the Church in times past, The Church of Jesus Christ of Latter-day Saints will not be overcome by general apostasy. The scriptures teach that the Church will never again be destroyed (see D&C 138:44; see also Daniel 2:44).
Joseph Smith said, "The greatest responsibility in this world that God has laid upon us is to seek after our dead," (Journal of Discourses, vol. 6, p. 7).
Doctrine and Covenants 128
An epistle from Joseph Smith the Prophet to The Church of Jesus Christ of Latter-day Saints, containing further directions on baptism for the dead, dated at Nauvoo, Illinois, 6 September 1842 (see History of the Church, 5:148–53).
11 Now the great and grand secret of the whole matter, and the summum bonum of the whole subject that is lying before us, consists in obtaining the powers of the Holy Priesthood. For him to whom these keys are given there is no difficulty in obtaining a knowledge of facts in relation to the salvation of the children of men, both as well for the dead as for the living....
15 And now, my dearly beloved brethren and sisters, let me assure you that these are principles in relation to the dead and the living that cannot be lightly passed over, as pertaining to our salvation. For their salvation is necessary and essential to our salvation, as Paul says concerning the fathers—that they without us cannot be made perfect—neither can we without our dead be made perfect.
What did Jesus say?
59And he said unto another, Follow me. But he said, Lord, suffer me first to go and bury my father. 60Jesus said unto him, Let the dead bury their dead: but go thou and preach the kingdom of God.
Luke 9
28Then said they unto him, What shall we do, that we might work the works of God? 29Jesus answered and said unto them, This is the work of God, that ye believe on him whom he hath sent.
John 6
No, God never told us to seek after our dead!
He has showed you, O man, what is good. And what does the LORD require of you? To act justly and to love mercy and to walk humbly with your God.
Micah 6:8
35Then one of them, which was a lawyer, asked him a question, tempting him, and saying, 36Master, which is the great commandment in the law? 37Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind. 38This is the first and great commandment. 39And the second is like unto it, Thou shalt love thy neighbour as thyself. 40On these two commandments hang all the law and the prophets.
Matthew 22