Christmas is a perfect time to "unleash" the joy of Christianity and to share it with others who can't help but be affected by it. We can share this joy with our children and others even through the simplest traditions of Christmas.
Cardinal Ratzinger said:
Even a custom like Christmas baking ... has its roots in the Church's Advent liturgy, which makes its own the glorious words of the Old Testament... 'In that day, the mountains will drip with sweetness, and the rivers will flow with milk and honey.' People of old found in such words the embodiment of their hopes for a world redeemed.......
Perhaps the right way to celebrate Advent is to let the signs of God's love that we receive in this period penetrate our soul, without resistance, without questions and quibbling. Warmed by these signs, we can then receive in full confidence the immeasurable kindess of this child.
(Quoted from The Blessing of Christmas by Cardinal Ratzinger, Ignatius Press)