Men are mortal, God is immortal.
That which is immortal cannot by definition become mortal.
Therefore, God cannot come as a man.
Man, on the other hand is made in the image of God.
God’s purpose is to fill the earth with his glory.
Numbers 14:21 But as truly as I live, all the earth shall be filled with the glory of the LORD.
His glory will be in the form of men and women made equal to the angels and made immortal like their creator.
Luke 20:35… they which shall be accounted worthy to obtain that world, and the resurrection from the dead, neither marry, nor are given in marriage:36 Neither can they die any more: for they are equal unto the angels; and are the children of God, being the children of the resurrection.
This is made possible through the man, Jesus Christ, fathered by God through Mary, and therefore mortal, who lived a sinless life and gave it as a sacrifice for sin.
Because he had not sinned God raised him from the dead to eternal life.
After his resurrection he ascended bodily to heaven.
Hebrews 10:12 But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God;
God made him the future judge of all men.
He will return to the earth at the appointed time.
Acts 17:31 Because he (God) hath appointed a day, in the which he will judge the world in righteousness by that man whom he hath ordained; whereof he hath given assurance unto all men, in that he hath raised him from the dead.
When he returns he will establish the kingdom of God on earth.
Those who want to be part of the kingdom of God must believe and obey the gospel.
By repentance and immersion in water for the remission of past sins they are counted as being ‘in Christ’.
Along with the faithful of all ages they will be raised from the dead when he returns and given the divine nature and live forever on the earth.
Paul explains what is going to happen.
1 Corinthians 15:20 But now is Christ risen from the dead, and become the firstfruits of them that slept. 21 For since by man came death, by man came also the resurrection of the dead. 22 For as in Adam all die, even so in Christ shall all be made alive. 23 But every man in his own order: Christ the firstfruits; afterward they that are Christ’s at his coming. 24 Then cometh the end, when he shall have delivered up the kingdom to God, even the Father; when he shall have put down all rule and all authority and power. 25 For he must reign, till he hath put all enemies under his feet. 26 The last enemy that shall be destroyed is death. 27 For he hath put all things under his feet. But when he saith all things are put under him, it is manifest that he is excepted, which did put all things under him. 28 And when all things shall be subdued unto him, then shall the Son also himself be subject unto him that put all things under him, that God may be all in all.
God’s purpose then, is not that he should come as a man, but that man might become like their creator.
I hope you find this helpful.