Perhaps I missed it in my first reading of this post and replies, but Jesus' main teaching was far more than "love" and Kingdom Come.
First: His purpose in life and mission was the Atonement.
10 Behold, I am Jesus Christ, whom the prophets testified shall come into the world.
11 And behold, I am the light and the life of the world; and I have drunk out of that bitter cup which the Father hath given me, and have glorified the Father in taking upon me the sins of the world, in the which I have suffered the will of the Father in all things from the beginning.
Second: How we are saved
31 Behold, verily, verily, I say unto you, I will declare unto you my doctrine.
32 And this is my doctrine, and it is the doctrine which the Father hath given unto me; and I bear record of the Father, and the Father beareth record of me, and the Holy Ghost beareth record of the Father and me; and I bear record that the Father commandeth all men, everywhere, to repent and believe in me.
33 And whoso believeth in me, and is baptized, the same shall be saved; and they are they who shall inherit the kingdom of God.
34 And whoso believeth not in me, and is not baptized, shall be damned.
35 Verily, verily, I say unto you, that this is my doctrine, and I bear record of it from the Father; and whoso believeth in me believeth in the Father also; and unto him will the Father bear record of me, for he will visit him with fire and with the Holy Ghost.
36 And thus will the Father bear record of me, and the Holy Ghost will bear record unto him of the Father and me; for the Father, and I, and the Holy Ghost are one.
Sure, love and Kingdom, but what did he do to show and demonstrate his love of the Father and all of the Father's children (us/mankind) - he did the work of the Father, to bring to pass the immortality and eternal life on man. Immortality = resurrection for all people. Eternal Life = the life the Father and Son enjoy, exalted in the Heavenly Kingdom.
How to be saved = faith in Christ as the one and only Savior & Redeemer & way back to the Father, repentance each and every day, baptism by those called of God, receiving the Holy Ghost by the laying on of hands by those called if God (born again), enduring to the end by keeping the commandments where we are saved by grace.
This is the Doctrine of Christ.
3 Nephi 11
https://www.lds.org/scriptures/bofm/3-ne/11?lang=eng
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