These are definitely some of my favorite types of scripts. They’re very little fuss to write; just work out who says what, assign the rest to a narrator, take out the ‘and Mary answered,’ BOOM! Script finished!
Bonus point: You don’t have to worry about it being scripturally accurate; it will be (just check you haven’t been over keen on the delete button).
Here are the Christmas bits from Luke and Matthew nicely divided into chunks so you can sing between acting or swap costumes in order to have as many Marys as possible. There’s also a combined script if you’d like to max out your gospelly Christmasness.