According to the Mormon faith, God the Father is an exalted, immortal man with a glorified physical body of flesh and bones:
22 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. Were it not so, the Holy Ghost could not dwell in us. (Doctrine and Covenants 130)
However, the only true Father of our Lord Jesus Christ is not a Man, and has never been a Man, and therefore does not have a flesh body of any kind.
Rather God is Spirit by nature, which is distinguished and differentiated from that which is flesh, whether that of humans and or beasts:
“Now the Egyptians are men and not God, And their horses are flesh and not spirit; So Yahweh will stretch out His hand, And he who helps will stumble, And he who is helped will fall, And all of them will come to an end together.” Isaiah 31:3 Legacy Standard Bible (LSB)
“But an hour is coming, and now is, when the true worshipers will worship the Father in spirit and truth; for such people the Father seeks to be His worshipers. God is spirit (pneuma), and those who worship Him must worship in spirit and truth.” John 4:23-24 LSB
Now contrast this with what the risen Christ said about a spirit not having flesh and bones:
“Now while they were telling these things, He Himself stood in their midst and said to them, ‘Peace to you.’ But being startled and frightened, they were thinking that they were seeing a spirit (pneuma). And He said to them, ‘Why are you troubled, and why do doubts arise in your hearts? See My hands and My feet, that it is I Myself; touch Me and see, for a spirit (pneuma) does not have flesh and bones as you see that I have.’ And when He had said this, He showed them His hands and His feet. And while they still were not believing because of their joy and were still marveling, He said to them, ‘Have you anything here to eat?’ They gave Him a piece of a broiled fish, and He took it and ate it before them.” Luke 24:36-43 LSB
The Lord Jesus also contrasted that which is flesh and blood from the Father who is in heaven:
“He said to them, ‘But who do you say that I am?’ And Simon Peter answered and said, ‘You are the Christ, the Son of the living God.’ And Jesus answered and said to him, “Blessed are you, Simon Bar-Jonah, because flesh and blood did not reveal this to you, but My Father who is in heaven.’” Matthew 16:15-17 LSB
Moreover, the God-breathed Scriptures describe the Father as the only true God:
“And this is eternal life, that they may know You the only true God, and Jesus Christ whom You have sent.” John 17:3
“For they themselves report about us what kind of an entrance we had with you, and how you turned to God from idols to serve a living and true God, and to wait for His Son from heaven, whom He raised from the dead, Jesus, who rescues us from the wrath to come.” 1 Thessalonians 1:9-10 LSB
According to the Hebrew Bible, YHWH is the only true God and has been such from before creation, since he has always existed as God:
“Now for many days Israel was without the true God and without a teaching priest and without law. But in their distress they turned to Yahweh, the God of Israel, and they searched for Him, and He was found by them.” 2 Chronicles 15:3-4 LSB
“A Prayer of Moses, the man of God. Lord, You have been our dwelling place from generation to generation. Before the mountains were born Or You brought forth the earth and the world, Even from everlasting to everlasting, You are God.” Psalm 90:1-2 LSB
“Yahweh reigns, He is clothed with majesty; Yahweh has clothed and girded Himself with strength; Indeed, the world is established, it will not be shaken. Your throne is established from of old; You are from everlasting.” Psalm 93:1-2 LSB
“A Prayer of the afflicted when he is faint and pours out his complaint before Yahweh. O Yahweh, hear my prayer! And let my cry for help come to You… But You, O Yahweh, abide forever, And the remembrance of Your name from generation to generation… This will be written for the generation to come, And a people yet to be created will praise Yah. For He looked down from His holy height; From heaven Yahweh gazed upon the earth, To hear the groaning of the prisoner, To set free those who were doomed to death, To recount the name of Yahweh in Zion And His praise in Jerusalem, When the peoples are gathered together, And the kingdoms, to serve Yahweh. He has afflicted my strength in the way; He has shortened my days. I say, ‘O my God, do not take me away in the midst of my days, Your years are from generation to all generations. Of old You founded the earth, And the heavens are the work of Your hands. Even they will perish, but You will remain; And all of them will wear out like a garment; Like clothing You will change them and they will be changed. But You are the same, And Your years will not come to an end.’” Psalm 102:1, 12, 18-27 LSB
“Then Hezekiah took the letter from the hand of the messengers and read it, and he went up to the house of Yahweh and spread it out before Yahweh. And Hezekiah prayed to Yahweh saying, ‘O Yahweh of hosts, the God of Israel, who is enthroned above the cherubim, You are the God, You alone, of all the kingdoms of the earth. You have made heaven and earth. Incline Your ear, O Yahweh, and hear; open Your eyes, O Yahweh, and see; and listen to all the words of Sennacherib, who sent them to reproach the living God. Truly, O Yahweh, the kings of Assyria have laid waste to all the countries and their lands and have cast their gods into the fire, for they were not gods but the work of men’s hands, wood and stone. So they have destroyed them. But now, O Yahweh our God, save us from his hand that all the kingdoms of the earth may know that You are Yahweh, You alone.’” Isaiah 37:14-20 LSB
“But Yahweh is the true God; He is the living God and the everlasting King. At His wrath the earth quakes, And the nations cannot endure His indignation. Thus you shall say to them, ‘The gods that did not make the heavens and the earth will perish from the earth and from under the heavens.’ It is He who made the earth by His power, Who established the world by His wisdom; And by His understanding He has stretched out the heavens.” Jeremiah 10:10-12 LSB
“Are You not from everlasting, O Yahweh, my God, my Holy One? We will not die. You, O Yahweh, have placed them to judge; And You, O Rock, have established them to reprove.” Habakkuk 1:12 LSB
“After these things I looked, and behold, a door standing open in heaven, and the first voice which I had heard, like the sound of a trumpet speaking with me, said, ‘Come up here, and I will show you what must take place after these things.’ Immediately I was in the Spirit, and behold, a throne was standing in heaven, and One sitting on the throne. And He who was sitting was like a jasper stone and a sardius in appearance; and there was a rainbow around the throne, like an emerald in appearance. Around the throne were twenty-four thrones, and upon those thrones I saw twenty-four elders sitting, clothed in white garments, and golden crowns on their heads. And out from the throne come flashes of lightning and sounds and peals of thunder. And there were seven lamps of fire burning before the throne, which are the seven Spirits of God.
“And before the throne there was something like a sea of glass, like crystal. And in the center and around the throne, four living creatures full of eyes in front and behind. And the first creature was like a lion, and the second creature like a calf, and the third creature had a face like that of a man, and the fourth creature was like a flying eagle. And the four living creatures, each one of them having six wings, are full of eyes around and within, and day and night they do not cease to say, ‘Holy, holy, holy is the Lord God, the Almighty, who was and who is and who is to come.’
“And when the living creatures give glory and honor and thanks to Him who sits on the throne, to Him who lives forever and ever, the twenty-four elders will fall down before Him who sits on the throne, and will worship Him who lives forever and ever, and will cast their crowns before the throne, saying, ‘Worthy are You, our Lord and our God, to receive glory and honor and power, for You created all things, and because of Your will they existed, and were created.’” Revelation 4:1-11 LSB
In light of the above, the only way that the Father can be the only true God is if he is YHWH. And since the Father is YHWH then he has always been and will always be God, and has never been a Man. Moreover, the Father never became a human being, unlike the Son (who is also YHWH) that did.
Therefore, the Father whom Mormons worship is a false god, which makes Joseph Smith a false prophet and an antichrist (Cf. Matt. 7:14-20; 24:23-25; 2 Cor. 11:1-4, 13-15; 1 John 2:22-23).
FURTHER READING
WHO IS THE ELOHIM OF MORMONISM?, PT. 2
THE MORMON SATAN & PREMORTALITY
THE BIBLICAL GOD VERSUS THE MORMON GODS, PT. 2, PT. 2B
Answering Islam Blog 
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