Without the birth of Jesus, there would not be any salvation for anyone of us.
Jesus the Son of God became a man.
He called himself "the Son of Man", the Messiah, the anointed one to do what God the Father sent him to do.
As a man, Jesus' perfect obedience from the cradle to the cross is what we all need, but what every one of us by nature lacks.
All we have is sin.
All Jesus has is perfect obedience or righteousness.
All we deserve is death, and death is just what Jesus endured for us, though he didn't deserve it.