In which short story does Dino Buzzati tell about a spaceship landing on a church?

I need to find this story by the great Italian writer Buzzati but I cannot remember the name of the story or the book it's from. In the story a spaceship lands on top of a church and the aliens ask the priest why they put those antennas (crosses) everywhere. Then they have a nice dialog about Jesus, Adam and Eve and religion. I'd appreciate your help. Thank you.