On the surface, that might sound reasonable. But if you look closely, you will see that it does not really do justice to Luke’s narrative. Mary and Zechariah and Elizabeth were not gullible bumpkins who didn’t know how babies were made and believed fantastical stories (nor, for that matter, were Luke and his original readers). They found the whole idea just as unlikely as you and I might, but that’s exactly the point! The great theological truth that Luke is bringing to the forefront by including these events in his “orderly account” is that God’s salvation will come in a seemingly impossible way.