Emanuel is translated as "God with us". That was the biggest message of Jesus and of the birth narrative. The story in my opinion was meant to give a graphic example of what Jesus taught in later life He took the idea of God being only in the Temple and moved the focus to individuals. God was and is with us, not hidden behind the veil of the Temple.
Jesus was a reformer. His path was meant to bring us closer to the divine and to free us from the rules and structures of the Pharisees. His path broke free from the rigid rules and relied on the simple commandment to love one another.
As I celebrate this season and reread the birth narratives I know that indeed a new light did come into the world. May the light of this season brighten your days.
Note: Sometimes I get off on a theological bent and I have to reassert that what I write is just my opinion. Take what you like and leave the rest.