When Joseph Smith, Jr. first concocted the Book of Mormon, he had more or less orthodox views of God, that is, that there is only ONE God and that the Father, Son, and Holy Spirit constituted that One God. There are some verses that he wrote that teach the Son IS the Father, or that the Son is the Father and the Son. So his early views of God included God’s Oneness to the extreme, with almost no distinction of Persons in the Godhead. But at least there was only ONE God.
For LDS Jesus can be referred to as the Father and the Son, Christ is sometimes called Father because of his role as Creator from the beginning before his mortal birth, and acting under the direction of the Father, Jesus was Jehovah, the Lord Omnipotent, through whom God created worlds
Jesus Christ is also known as Father through the spiritual rebirth of mankind as the foreordained Redeemer, he became the “author of eternal salvation unto all them that obey him” He is the Saviour. No person will come unto the Father except through him and by his name
Jesus is called Father because of the authority God gave him to act for the Father. He explained in Jerusalem: “I can of mine own self do nothing…I am come in my Father’s name”. LDS believe that all revelation since the fall has come through Jesus Christ, who is the Jehovah of the Old Testament…. The Father has never dealt with man directly and personally since the fall, and he has never appeared except to introduce and bear record of the Son" Latter-day Saints understand this to mean that, except when introducing the Son, God always acts and speaks to mankind through Jesus Christ.
It was not until shortly before his death in 1844, a dozen years after the Book of Mormon was written, that his view of God changed to include a plurality of Gods and the idea that God was once a man who progressed to become God and that worthy Mormons can repeat that process and become gods themselves over other earths whose inhabitants would worship those exalted Mormons as gods.
Some of what we understand will not by explicitly be found in the Bible, however, there is much of what the 1st century writers understood about the Gospel that is similar to that of LDS understanding.