„First of all, Jesus is so important because of his person. The Bible makes him out to be the only God-man in human history. I’m sure we’re all familiar with men of God (Abraham, Moses, David, etc.) but not so with God-men. Jesus is qualitatively different. No one else is on par with him. Scripture points to Christ as fully God and fully man.
Why’s that so crucial? Because if Christ weren’t man, He couldn’t take the place of sinful man on the cross! And if Christ weren’t God, His sacrifice wouldn’t be eternally efficacious. Thanks to his double nature, Jesus is the perfect Saviour; the only Mediator between God and sinful humankind.”
http://evangelicalfocus.com/magazine/3073/The_Christ_of_Christmas