In my youth I had a Bahai as a friend, whose family didn't celebrate Christmas.
At the center of Bahaitum is the belief in a transcendent God, the mystical unity of religions and the belief in the unity of humanity in all its diversity. The Baha'i advocate action-oriented ethics that are committed to a humanitarian vision of social development and social cohesion.
In addition to the work of Bahāʾullāh, which is regarded as the revelation of God, the Bahai also include the scriptures of other world religions as a common religious heritage. According to the Bahai faith, the founders of religion all draw from the same divine source. The unmistakable differences between the religions are primarily due to history: they are seen as an expression of different needs and cultural characteristics.