In the A Catechism of Christian Doctrine (the
original “Penny Catechism” [1971]), there is an affirmation that Jesus was born
Christmas day:
51. On what day was our Savior born?
Our Saviour was born on Christmas day. (A Catechism of Christian Doctrine [London: Catholic Truth Society, 2005], 15)
Our Saviour was born on Christmas day. (A Catechism of Christian Doctrine [London: Catholic Truth Society, 2005], 15)
Of course, this is not an universal catechism, so it not necessarily
reflective of the universal ordinary magisterium so is not binding (unlike the Catechism of the Council of Trent [1566] or the Catechism of the Catholic Church [1994]); notwithstanding,
it does show that there are some within the Catholic Church who believe 25th
December is the birthday of Jesus. Indeed, Taylor Marshall, a convert to the
Catholic Church, has written in defence of 25th December as Jesus’
birthday:
(As an aside, I wrote
a post refuting Marshall’s apologetic for the Bodily Assumption of Mary at: Refuting
Taylor Marshall on the Bodily Assumption of Mary)