I am a cynical agnostic with pagan sympathies, so, I don't celebrate this season as a religious holiday. For me, it's merely a wonderful time to spend with loved ones. Here in Canada, it's largely celebrated as the Christian holiday celebrating the birth of Jesus.
There are many religions who hold this season sacred, however.
So, to my Wiccan and Druidic friends, let me wish you a Joyous Solstice Season. 'Tis Nollagh. Welcome the returning light.
To my Germanic/Scandinavian pagan friends, blessings of the Yule Father upon you. Thank you for keeping the light burning, doing your part to stave off Ragnarök. I appreciate it.
If there are any Persian pagans reading this, Happy "Birthday of the Unconquered Sun" to Mithras, born of a virgin, miracle-worker and saviour. I'm not sure what your festival is called, precisely, but I wish you many joys in your celebrations.
To my Jewish friends, Happy (belated) Hanukkah, and Feast of Lights.
There are many birthdays of gods and demigods observed this time of year, so a quick Happy Birthday to:
Adonis, Agdistis, Attis, Zeus, Heracles, Corybas, Perseus and Dionysus (Greek and region), Romulus and Remus (Roman), Zoroaster (Persian), Krishna and Buddha (both Indian), Beddou (Eastern Asian), Tammuz (Sumerian), Horus and Osiris (both Egyptian), Quetzalcoatl (Aztec), and, of course, Jesus (whether it's his actual birthday or not).
To name but a few!
May those celebrating these deities' associated festivities have a wonderful celebration!
In whatever way you celebrate this season - be it pagan, or Abrahamic, or areligious - I sincerely wish you to best of holidays and an even better year to come.