I've never heard "Babe of Bethlehem" and will be looking it up. In your search for "spooky" or mystical Christmas carols, there's an Irish carol that would be great for your choir if you could find it.

The melody -- slow, melancholy, Judaic, and with a feel of "O Come Emmanuel" -- is fixed firmly in my mind, but unfortuntaely the title and lyrics aren't. All I have is this:

Shoon-a-shoon, I sing no psalm, little man although I am out of David's house and clan...

Hush-a-hoo, whirring of wings... Hush-a-hoo, stirring of strings...

though in slumber deep, his ears can hear my song of sleep.

The arrangement I heard was done by a women's choir. The soloist -- Lynn somebody -- had an unearthly alto voice. This is to be sung softly, thoughtfully, and almost as if Mary is dozing off herself, while the angels are singing her to sleep as she sings the baby to sleep.

But the way it's written, it could be any mother and child. Like many Irish carols from the mediaeval days, it is an expression of the mystery of motherhood and childbirth, rather than yet another celebration of Christianity as a religion. So if you could find it, this is one you might want to try. Luck, Mela