There were two ways in which Christ utterly and completely changed the world forever.
First, by the incarnation, Christ forever elevated the status of matter. No longer could matter be looked down upon as something unworthy of spirit, because God took on a body.
Second, by rising from the dead Christ defeated death. No longer is death the victor over life; now we can say with the Apostle, O Death, where is thy sting?
I find this interesting because human reasoning would tend to expect the savior of the world to change the world in only one way—by saving it. Elevating its dignity as well seems like too much to ask.