Background Information Christmas Day, December 25, is the most important festival in the Christian world. Originally Christmas was a religious rite and it did not become a fixed holiday until 440 A. D. Today, Christmas is still observed as an anniversary of the birthday of Christ, but its religious aspect is almost lost to the lay world amidst all the commercialization and human excitement of it. The celebration usually includes an exchange of cards and presents among relatives and friends, decorating the sitting room with a Christmas tree, and a feast featuring a turkey or a goose.Background Information Christmas Day, December 25, is the most important festival in the Christian world. Originally Christmas was a religious rite and it did not become a fixed holiday until 440 A. D. Today, Christmas is still observed as an anniversary of the birthday of Christ, but its religious aspect is almost lost to the lay world amidst all the commercialization and human excitement of it. The celebration usually includes an exchange of cards and presents among relatives and friends, decorating the sitting room with a Christmas tree, and a feast featuring a turkey or a goose