Jesus was the LORD before He came to earth.
1Co 15:47 KJV The first man is of the earth, earthy: the second man is the Lord from heaven.
God did the reconciling on HIS part, the body of Christ is still being reconciled from its perspective. Daily there are those being reconciled.
Reconciliation requires TWO parties.
You're such a simpleton.
The real simpletons are those that reject the truth of God's word.
Jesus was not Lord until he defeated sin, death and the devil, Acts 2:36.
He had to earn our salvation for us by his doing and his dying.
You are assuming that Jesus was born all God. He was born both God and man, our humanity was constituted in him.
You are the simpleton. You should know these things.