"Therefore, just as sin entered the world through one man, and death through sin, and in this way death came to all people, because all sinned— To be sure, sin was in the world before the law was given, but sin is not charged against anyone’s account where there is no law. Nevertheless, death reigned from the time of Adam to the time of Moses, even over those who did not sin by breaking a command, as did Adam, who is a pattern of the one to come. But the gift is not like the trespass. For if the many died by the trespass of the one man, how much more did God’s grace and the gift that came by the grace of the one man, Jesus Christ, overflow to the many! Nor can the gift of God be compared with the result of one man’s sin: The judgment followed one sin and brought condemnation, but the gift followed many trespasses and brought justification. For if, by the trespass of the one man, death reigned through that one man, how much more will those who receive God’s abundant provision of grace and of the gift of righteousness reign in life through the one man, Jesus Christ!" Romans 5:12-17
Why would He want to do that?
Because the first Adam blew it big time!
The second Adam had to undo what the first Adam did.
The first Adam was hand-crafter by God. Therefore, he was created with a sinless nature so He could walk with God.
The second Adam was concieved by the Holy Spirit in the womb of a virgin, therefore, He was born sinless. Not only could He walk with God, He came from God and was in fact, God in the flesh!
The first Adam was placed in Paradise and enjoyed a personal intimate friendship with God every day - until he rebelled and was expelled.
The second Adam was in Paradise but left it to come to earth. He gave up His paradise to suffer and die in our world in order to regain access to Paradise for you and me!
The first Adam was perfect but sinned because he wanted to be God.
The second Adam WAS God but became man - albeit a perfect man - for one reason, so He could die to atone for our sins! He had to be sinless so He could take our sins upon Himself!
Christmas is about the arrival of the second Adam! The second Adam means a second chance!