I think it would help to look what Bible actually says.
Bible tells Jesus is a man and image of God. Bible tells also that God dwells in Jesus, similarly as in disciples of Jesus. Jesus is also born of God as many who received him can be.
Who is Jesus?
But as many as received him, to them he gave the right to become God's children, to those who believe in his name: who were born not of blood, nor of the will of the flesh, nor of the will of man, but of God.
John 1:12-13
It is the spirit who gives life. The flesh profits nothing. The words that I speak to you are spirit, and are life.
John 6:63
He who does righteousness is righteous, even as he is righteous. He who sins is of the devil, for the devil has been sinning from the beginning. To this end the Son of God was revealed, that he might destroy the works of the devil. Whoever is born of God doesn't commit sin, because his seed remains in him; and he can't sin, because he is born of God. In this the children of God are revealed, and the children of the devil. Whoever doesn't do righteousness is not of God, neither is he who doesn't love his brother.
1 John 3:7-10
I have understood sin means person rejects or lives apart from God. And in the beginning people were expelled to this first death. Here we are born apart from God and so in sin. But Jesus was not born the same way. Jesus was born by Holy Spirit, which is why he was not born in sinful state.
The angel answered her, "The Holy Spirit will come on you, and the power of the Most High will overshadow you. Therefore also the holy one who is born from you will be called the Son of God.
Luke 1:35
Because of the way Jesus was born, he didn’t have sin when he was born. And by what I know he was loyal/faithful to God and so didn’t sin after he was born.
Now that no man is justified by the law before God is evident, for, "The righteous will live by faith."
Galatians 3:11
But the righteous will live by faith. If he shrinks back, my soul has no pleasure in him.
Hebrews 10:38