What is Faith in Jesus Christ?

I remember Christ always taught us to have faith in him. Who could forget the story of Peter, walking on the water toward Christ, and how when he saw the boistrous waters around him he feared and began to sink. And Christ caught him and said, "O ye of little faith."

The Book of Mormon says, "For it is by faith that miracles are wrought; and it is by faith that angels appear and minister unto men... For no man can be saved, according to the words of Christ, save they shall have faith in his name."  -Moroni 7:37-38

I talked with a woman on a plane ride yesterday -- a woman of great faith in Christ. I told her about my fears in life, my pains and discouragement. She urged me to have faith in Christ. How sad it would be if I didn't have that faith. I confessed I did not understand how Christ saves us, how the Atonement brings us back to God. I believe it does, but I don't know how, and when I wonder and think about it I realize I am also hearing in my mind another voice, telling me what to fear and why good things are impossible. If Satan can say such things in my mind, and I don't know how to dispute them, then my faith depends on what I have not received. I have faith that I can learn the truth about it, but fear because I don't know the truth yet.

Still, I would like to think that I know a lot about how Christ saves. At least I know the simple doctrine of it.

"We believe that man will be punished for their own sins, and not for Adam's transgression.
"We believe that through the Atonement of Christ, all mankind may be saved, by obedience to the laws and ordinances of the Gospel.
"We believe that the first principles and ordinances of the gospel are: first, Faith in the Lord Jesus Christ; second, Repentance; third, Baptism by immersion for the remission of sins; fourth, Laying of hands for the gift of the Holy Ghost." - Articles of Faith, 2-4

So if we are saved by faith, repentance, and the ordinances of the gospel, then it seems straightforward, as long as I understand what faith and repentance are! Repentance is clear enough to me, even if it's not easy: when I learn of my sins, I give them up for righteousness instead. Faith is believing that good things are true, that God can bring us to them: believing in life, love, friends, family, etc. I say that this is faith, and I also say it is much the same as Faith in Christ:

"And behold, there were divers ways that he did manifest things unto the children of men, which were good; and all things which are good cometh of Christ; otherwise men were fallen, and there could no good thing come unto them." - Moroni 7:24

So have faith, I say, and trust in the promise of faith:

"And Christ hath said: If ye will have faith in me ye shall have power to do whatsoever thing is expedient in me." - Moroni 7:33