Prove that Michael was Jesus, using the name Immanuel, from Isaiah 8:7-8, right?

Question

Isaiah 7:14-15
14Therefore the Lord himself shall give you a sign; Behold, a virgin shall conceive, and bear a son, and shall call his name Immanuel.15Butter and honey shall he eat, that he may know to refuse the evil, and choose the good.

Matthew 1:20-25
20But while he thought on these things, behold, the angel of the Lord appeared unto him in a dream, saying, Joseph, thou son of David, fear not to take unto thee Mary thy wife: for that which is conceived in her is of the Holy Ghost.21And she shall bring forth a son, and thou shalt call his name JESUS: for he shall save his people from their sins.22Now all this was done, that it might be fulfilled which was spoken of the Lord by the prophet, saying,23Behold, a virgin shall be with child, and shall bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us.24Then Joseph being raised from sleep did as the angel of the Lord had bidden him, and took unto him his wife:25And knew her not till she had brought forth her firstborn son: and he called his name JESUS.

Isaiah 8:7-8
7Now therefore, behold, the Lord bringeth up upon them the waters of the river, strong and many, [even] the king of Assyria, and all his glory: and he shall come up over all his channels, and go over all his banks:
8And he shall pass through Judah; he shall overflow and go over, he shall reach [even] to the neck; and the stretching out of his wings shall fill the breadth of thy land, O Immanuel.

Answer 1

Jesus means "GOD saves" and Immanuel means "GOD with us"

John 1:1 In the beginning was the Word, and the Word was with God, and the Word was God. 2 He was in the beginning with God....And the Word became flesh and dwelt among us, and we have seen his glory, glory as of the only Son from the Father, full of grace and truth. John 1:14

1 Timothy 1:15 The saying is trustworthy and deserving of full acceptance, that Christ Jesus came into the world to save sinners, of whom I am the foremost.

Michael is an angel right?

Hebrews 1:1 Long ago, at many times and in many ways, God spoke to our fathers by the prophets, 2 but in these last days he has spoken to us by his Son, whom he appointed the heir of all things, through whom also he created the world. 3 He is the radiance of the glory of God and the exact imprint of his nature, and he upholds the universe by the word of his power. After making purification for sins, he sat down at the right hand of the Majesty on high, 4 having become as much superior to angels as the name he has inherited is more excellent than theirs. 5 For to which of the angels did God ever say, "You are my Son, today I have begotten you"? Or again, "I will be to him a father, and he shall be to me a son"? 6 And again, when he brings the firstborn into the world, he says, "Let all God's angels worship him." 7 Of the angels he says, "He makes his angels winds, and his ministers a flame of fire." 8 But of the Son he says, "Your throne, O God, is forever and ever, the scepter of uprightness is the scepter of your kingdom.

The Angel Michael, arch angel or not, is a servant of God, not Jesus Immanuel.

Answer 2

Jesus existed before His human birth on earth. Read John 1.