We might find the idea of shiny people with huge wings a bit far-fetched but we can understand the concept of some astounding manifestation of power and light. Whatever it actually was it gave a dramatic and challenging message to the least likely people to introduce us to the Baby Jesus. Shepherds were almost outcasts in Jewish society; they were "unclean" and forbidden to enter the Temple. They were, as a body, famed from drunkenness!
And we all know what the Angel's message was, as well. "Peace on Earth and Goodwill to all Men"? A noble seasonal sentiment, if ever there was one.
WRONG! Maybe not totally wrong but definitely incomplete.
The angel said to them, “Don't be afraid! I am here with good news for you, which will bring great joy to all the people. This very day in David's town your Savior was born—Christ the Lord! And this is what will prove it to you: you will find a baby wrapped in cloths and lying in a manger."
Suddenly a great army of heaven's angels appeared with the angel, singing praises to God: “Glory to God in the highest heaven, and peace on earth to those with whom he is pleased!"
And it's that last bit that changes the message. The Peace of Christmas is ONLY on offer to those "with whom God is pleased". So how, on earth, can a feeble human ever rise to the challenge of pleasing God, and pleasing Him all the time?
Something's got to change deep within human nature.