Spiritual Preparation(Alma 48:7)

Now it came to pass that while Amalickiah had thus been obtaining power by fraud and deceit, Moroni, on the other hand, had been preparing the minds of the people to be faithful unto the Lord their God.

What does it mean to be spiritual prepared? How can I prepare my mind to be faithful?

Are Mormons Christian?(Alma 46:15)

And those who did belong to the church were faithful; yea, all those who were true believers in Christ took upon them, gladly, the name of Christ, or Christians as they were called, because of their belief in Christ who should come.

As in the time of Captain Moroni (estimated to be about 70 B.C.), those who belong to the Mormon church today, who are true believers in Christ, gladly take upon themselves the name of Christ, or Christian! As stated in the prayer on the bread of the Sacrament of the Lord's Supper (the Eucharist or Holy Communion):

O God, the Eternal Father, we ask thee in the name of thy Son, Jesus Christ, to bless and sanctify this bread to the souls of all those who partake of it, that they may eat in remembrance of the body of thy Son, and witness unto thee, O God, the Eternal Father, that they are willing to take upon them the name of thy Son, and always remember him and keep his commandments which he has given them; that they may always have his Spirit to be with them. Amen. (D&C 20:77; emphasis mine.)

Spiritually Begotten of Christ(Mosiah 5:7)

And now, because of the covenant which ye have made ye shall be called the children of Christ, his sons, and his daughters; for behold, this day he hath spiritually begotten you; for ye say that your hearts are changed through faith on his name; therefore, ye are born of him and have become his sons and his daughters.

What are covenants? What does it mean to be spiritually begotten of Christ? How are our hearts changed through Him? What does it mean to be His son or daughter?

Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new (2 Corinthians 5:17).

The Wise Woman Built Her HouseUpon a Rock (Helaman 5:12)

Helaman counseled his sons Nephi and Lehi:

And now, my sons, remember, remember that it is upon the rock of our Redeemer, who is Christ, the Son of God, that ye must build your foundation; that when the devil shall send forth his mighty winds, yea, his shafts in the whirlwind, yea, when all his hail and his mighty storm shall beat upon you, it shall have no power over you to drag you down to the gulf of misery and endless wo, because of the rock upon which ye are built, which is a sure foundation, a foundation whereon if men build they cannot fall (Helaman 5:12).

Jesus taught this same concept during His ministry:

Therefore whosoever heareth these sayings of mine, and doeth them, I will liken him unto a wise man, which built his house upon a rock:

And the rain descended, and the floods came, and the winds blew, and beat upon that house; and it fell not: for it was founded upon a rock.

And every one that heareth these sayings of mine, and doeth them not, shall be likened unto a foolish man, which built his house upon the sand:

And the rain descended, and the floods came, and the winds blew, and beat upon that house; and it fell: and great was the fall of it (Matthew 7:24-27).

He affirmed the importance of building on His rock - and helped define what that means - in latter-day revelation:

Therefore, fear not, little flock; do good; let earth and hell combine against you, for if ye are built upon my rock, they cannot prevail.

Look unto me in every thought; doubt not, fear not.

Behold the wounds which pierced my side, and also the prints of the nails in my hands and feet; be faithful, keep my commandments, and ye shall inherit the kingdom of heaven (D&C 6:34, 36-37).