While it is true that many of our world's Christmas traditions have roots in paganism (the Christmas tree, for instance)...there has been a huge movement in the Church over the years to reclaim those for the holy celebration of the birth and life of Christ. Just listen to the lyrics of any popular Christmas carol...that the whole world is singing this time of year. That's the gospel, coming for the lost. That's light breaking through the darkness.
We have two wonderful podcast series on Advent and feel they could be a deep encouragement for you: