Salvation Through Faith - Mosiah 3:9

And lo, he cometh unto his own, that salvation might come unto the children of men even through faith on his name...

Christianity is so peculiar in this one doctrine - that God was made flesh, and dwelt among us (John 1:14). And not only did He come to live with us, but was made mortal and suffered death at our hands!

Isaiah prophesied thus:

He is despised and rejected of men; a man of sorrows, and acquainted with grief: and we hid as it were our faces from him; he was despised, and we esteemed him not. Surely he hath borne our griefs, and carried our sorrows: yet we did esteem him stricken, smitten of God, and afflicted. But he was wounded for our transgressions, he was bruised for our iniquities: the chastisement of our peace was upon him; and with his stripes we are healed. All we like sheep have gone astray; we have turned every one to his own way; and the Lord hath laid on him the iniquity of us all. He was oppressed, and he was afflicted, yet he opened not his mouth: he is brought as a lamb to the slaughter, and as a sheep before her shearers is dumb, so he openeth not his mouth. He was taken from prison and from judgment: and who shall declare his generation? for he was cut off out of the land of the living: for the transgression of my people was he stricken. (Isaiah 53:3-8)

In fact, all prophets have testified of this:

... [A]ll the prophets who have prophesied ever since the world began—have they not spoken more or less concerning these things? Have they not said that God himself should come down among the children of men, and take upon him the form of man, and go forth in mighty power upon the face of the earth? Yea, and have they not said also that he should bring to pass the resurrection of the dead, and that he, himself, should be oppressed and afflicted? (Mosiah 13:33-35) (Jacob 4:4-5)

Not only did the prophets testify of this, but many gave their life for this very testimony. Consider the sentence of the prophet Abinadi:

And [the king] said unto him: Abinadi, we have found an accusation against thee, and thou art worthy of death. For thou hast said that God himself should come down among the children of men; and now, for this cause thou shalt be put to death unless thou wilt recall all the words which thou hast spoken evil concerning me and my people. Now Abinadi said unto him: I say unto you, I will not recall the words... (Mosiah 17:7-9)

The prophet Joseph Smith suffered the same fate for the same reason:

If there were priests among them of all the different sects, they hated us, and that most cordially too. If there were generals, they hated us; if there were colonels, they hated us; and the soldiers, and officers of every kind, hated us; and the most profane, blasphemous, and drunkards; and whoremongers, hated us—they all hated us, most cordially. And now what did they hate us for? Purely because of the testimony of Jesus Christ. -- Joseph Smith

Jesus summed up the fate of the prophets and their tormentors thus:

Woe unto you, scribes and Pharisees, hypocrites! because ye build the tombs of the prophets, and garnish the sepulchres of the righteous, And say, If we had been in the days of our fathers, we would not have been partakers with them in the blood of the prophets. Wherefore ye be witnesses unto yourselves, that ye are the children of them which killed the prophets. Fill ye up then the measure of your fathers.

Wherefore, behold, I send unto you prophets, and wise men, and scribes: and some of them ye shall kill and crucify; and some of them shall ye scourge in your synagogues, and persecute them from city to city: That upon you may come all the righteous blood shed upon the earth, from the blood of righteous Abel unto the blood of Zacharias son of Barachias, whom ye slew between the temple and the altar. (Matthew 23:29-35)

Jesus Christ came and dwelt among us. He has experienced life firsthand, and through the atonement became intimately familiar with each one of us. It is my belief that not only did He suffer for our sins and pay the ransom in our behalf, but that in the process experienced the entirety of each of our lives. I believe that without going through the entirety of each of our lives, he would not be able to judge us, nor empathize fully with us, let alone atone for us. As such, He is intimately familiar with everything about us, our idiosyncrasies, weaknesses, strengths, desires, secret thoughts and actions... everything! Not as a passive observer mind you - but a participant.

This is how and why we can exercise faith in Him. By descending below all things (D&C 88:6), He has mastered all of them. I believe and have faith that it is only in and through His holy name that we can be saved, and that there is no other way.