Christianity has always held, from the earliest days, that Jesus was both fully God and fully Human. He was not God prancing around in a man-suit pretending to be human, but rather He ate, drank, slept, cried, rejoiced, farted and so forth. Nor was He just an extra special man with a few magic tricks and a hotline to heaven, but He really was God with man. Now, this is something of a tension, even a paradox, especially when ideas such as omnipresence, omnipotence and omniscience are considered primary attributes of God, as clearly Jesus was none of these - if He had been, He could hardly have been human. No, He was God who had taken on the limitations of being human. There's lots of learned material on the incarnation, as this concept is known, and it's worth looking up.
I believe that Jesus' very person embodies reconciliation of God with man, inasmuch as Jesus is both. However, in order to fully reconcile all that being human entails, this God-man needs to suffer, at least in part, all the **** things that happen to people. Injustice, innocent suffering, persecution, intolerance, and so on. Therefore, only by Jesus' death in the manner in which it occurred is the reconciliation between God and man fully made.
There is a story told, entitled The Long Silence. In this, the scene is judgement day. And many people are unhappy that God is going to stand in judgement over them, for various reasons. They point out the injustices they have suffered, the pain they have experienced, and so on, whilst God, up in heaven, has not had to go through all this. Who the hell is He to pass judgement on them?
They get together and create a series of demands that God must go through before He can have any right to criticise, let alone judge, them. He must be born to a people dominated by an oppressive occupying force. His birth is to be shrouded in shame and scandal. He must be forced to go into hiding for his life whilst still a child. He must be betrayed by his closest friends, slandered and unjustly condemned. Then He must be tortured, and executed in a shameful and agonising manner. Then there is silence as it is realised that God has already served this sentence.
Now, whilst this story is told in the context of judgement, which I think is a shame, it illustrates the full meaning of the incarnation. This incarnational theology carries on beyond the Resurrection and onto the Ascension. The Ascension receives precious little attention from many apologists, and I think that this is a great shame. Jesus ascension as still Man and God takes humanity permanently into God. We have a stake in Gods nature. The upshot of all this is that everything it means to be human is to be found within God, and everything it means to be God has been found within a Man. Thus is our reconciliation with God made possible. What this means can only be worked out by the individuals own walk in faith.