Why is it so unbelievable?

From the hymn O Come, All Ye Faithful, waxing Nicea:

God of God, Light of Light;
Lo, He abhors not the Virgin's womb:
Very God, begotten, not created;
O come let us adore Him, Christ the Lord.

It is because of this that the phrase "Mother of God" enters into our speech.

That's right. I said it. "Mother of God". Or Theotokos, if you will.

Isn't that nuts? Isn't that crazy? The shock in it has nothing to do with Mary. It has everything to do with the fact that the Creator of the universe condescends and takes on a human nature, made of ordinary flesh made of ordinary molecules made out of ordinary atoms that were fused in an ordinary star sometime in the past, just like you and me.

The logic of the universe (see John 1) is wrapped up in a tiny, crying, pooping baby.

This is the lengths to which God will go to redeem the world. By the standards of human wisdom, this is scandalous.

More reflections on this later.