Why is Christmas celebrated on December 25? Not, as you’ve probably heard, to co-opt pagan holidays such as Saturnalia.
Instead, according to Andrew McGowan
Thus, we have Christians in two parts of the world calculating Jesus’ birth on the basis that his death and conception took place on the same day (March 25 or April 6) and coming up with two close but different results (December 25 and January 6).
By the way, the first Christmas creche was created by Francesco. He had an amazing talent for theater. Picture him, for example, on Palm Sunday cutting away Chiara’s long hair. (Not everyone is convinced though that he wrote Il Cantico del Sole.)