We’ve all probably seen a children’s nativity play. But even if you haven’t, you can perhaps imagine the gist. They’re usually a creative conflation of the two different stories we have about Jesus’s birth from the Gospels of Luke and Matthew. There’s the setting in a manger at night, of course, with shepherds and angelic choirs, from Luke’s version. There are the Magi — the three wise men from the East — from Matthew’s version, though Matthew reports that the wise men showed up sometime after Jesus was born, not the night of his birth. And there is, of course, Mary and Joseph and baby Jesus, the central characters of…