There is no where in the Bible that resembles the doctrine of the trinity. As I read the New Testament I mark to the side of the verse, the number 2 and 3, each time separate beings are mentioned. Try it sometime. You'll be surprised how often it is in there.
Mormons believe and know that the Father, Son and Holy Ghost are one in purpose, not in body. They each have a roll to play. However there are ways in which the Christ is a Father, our Father and The Book of Mormon explains this.
Mosiah, a king in The Book Of Mormon explains it this way. From ch 5:
7 And now, because of the covenant which ye have made ye shall be called the achildren of Christ, his sons, and his daughters; for behold, this day he hath spiritually begotten you; for ye say that your hearts are bchanged through faith on his name; therefore, ye are cborn of him and have become his dsons and his daughters.
We are his children, he is our father through the covenant we make with him. As we have faith on his name he changes us and we are born of him spiritually.
Nephi, a prophet early on in the Book of Mormon also teaches us another way how Christ is our Father. In 2 Nephi 25:
12 But, behold, they shall have awars, and rumors of wars; and when the day cometh that the bOnly Begotten of the Father, yea, even the Father of heaven and of earth, shall cmanifest himself unto them in the flesh, behold, they will reject him, because of their iniquities, and the hardness of their hearts, and the stiffness of their necks.
We know through this and other sacred scripture that the Father had the plan, the blueprint if you will for the creation of the earth, but it was the Savior who carried out the plan and did all the work. He is the Father of heaven and earth. Heaven meaning the sky around us.