Mosiah 15

Ther are many of the so called "Christians" of our day that question whether members of The Church of Jesus Christ of Latter-day Saints are Christians are not. If the definition of a Christian is one that believes in the Christ of the Old and New Testament, follows His doctrine, and is His organization, then so called "Mormons" are Christians. If the definition is one of the 4th century Christian Churches where great religious leaders (men) of that day gathered to establish a uniformity of creeds and definitions of diety such as the "Trinity", then "Mormons" are not Christians for -

"WE believe in God, the Eternal Father, and in His Son, Jesus Christ, and in the Holy Ghost." (Pearl of Great Price | Articles of Faith 1:1)

And that -

"The Father has a body of flesh and bones as tangible as man's; the Son also; but the Holy Ghost has not a body of flesh and bones, but is a personage of Spirit." (Doctrine and Covenants | Section 130:22)

These are three distinct and seperate personages. Yet they are one as a husband and wife -

"For this cause shall a man leave his father and mother, and cleave to his wife;
8 And they twain shall be one flesh: so then they are no more twain, but one flesh." (New Testament | Mark 10:7 - 8)

It is clear that this unity is not necessarily one personage.

As Abinadi addresses the wicked priests, he asks them several questions -

"...did not Moses prophesy unto them concerning the coming of the Messiah, and that God should redeem his people? Yea, and even all the prophets who have prophesied ever since the world began—have they not spoken more or less concerning these things?
34 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?
35 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?" (Book of Mormon | Mosiah 13:33 - 35)

It becomes apparent that many plain and precious teachings have been removed from the Old Testament. And then Abinadi quotes the 53rd chapter of Isaiah which is one of the most informative and soul wrenching descriptions and purpose of the atonement. And then he explains the teachings of Isaiah and othe Old Testament prophets to the wicked priests -

"...I would that ye should understand that God himself shall come down among the children of men, and shall redeem his people.
2 And because he dwelleth in flesh he shall be called the Son of God, and having subjected the flesh to the will of the Father, being the Father and the Son—
3 The Father, because he was conceived by the power of God; and the Son, because of the flesh; thus becoming the Father and Son—
4 And they are one God, yea, the very Eternal Father of heaven and of earth." (Book of Mormon | Mosiah 15:1 - 4)

We begin to learn that the Savior created the heavens and earth under the direction of His Father. Thus the Savior is the great Jehovah. We also begin to understand that the Savior earns the title of "Father" (just as our earthly fathers earn their title) also because it is He, through His infinite atonement, that He gives us eternal life. Thus He becomes a "Father" as well as the literal mortal son of a Heavenly Father. One individual with two titles as well as two distinct and seperate beings that are one in unity and purpose. Though it may be confusing to some, it is made clear by Abinadi.