enoughisenough:
I believe Sea Breeze was speaking in the vernacular when using the expression "God's birthday."
Even Christians don't always go around being theologically exact and can call Christmas everything from "Jesus' birthday" to a "celebration of the birth of our Father in heaven."
None of this is technically correct, as I pointed out in a post on this thread earlier before.
After leaving the Watchtower, I used to teach both Catholic catechism and Protestant religion for a couple of decades. Christianity does not celebrate any "birthday" on the Christian yearly calendar, known as the "liturgical" calendar. It only celebrates or honors the death of martyrs, including that of Jesus Christ, on the day they died or were buried (such as "Good Friday" for Jesus).
Christmas (or as it is called on the Liturgical Calendar "The Nativity") is a religious observance to remind Christians of the miracle of the Incarnation, namely as described in Isaiah 7:14 where it reads that "he shall be called Immanuel," which Matthew explains means "God Is With Us," at chapter 1:23 of his gospel.
There were various Eucharistic feasts that were celebrated in honor of the miracle of the Incarnation (the belief that God became Man in the Person of Jesus Christ) throughout the early church, but they landed on different places on the Liturgical Calendar throughout the year.
One of the earliest celebrations of the Incarnation is known from the Jewish Christians that has come down to us in the Liturgy of Saint James. The written form of this mass that we now have in its current form is from the early 300s (probably right before the formal canonization of the New Testament) but portions of it do go back to before the Second Jewish Revolt.
There is a section for a celebration of the Incarnation. Still sung as part of the Roman Catholic liturgy today during the Christmas season, there is a hymn entitled Let All Mortal Flesh Keep Silence, and it is notably still part of the Night Prayer for Catholics beginning on Christmas Eve until February 2nd in the Liturgy of the Hours.
It was not until Christianity became the state religion of the Roman Empire and there was a demand to thus standarize the liturgy for the civilized world that the a date was settled for the Nativity. As we all know, we ended up with the date we now have--and it is not one day, but actually an 8-day feast called an octave.
As to Jesus being "God Almighty," Christmas, being the feast of the Incarnation and not a birthday--the "Incarnation" is the doctrine of God-made-man. That is the literal definition of the word "incarnation."
There is nothing wrong with using wording like "Jesus' birthday" or "God's birthday" or an atheist joining in the fun any more than a Jew eating attending a holiday party and eating a Christmas cookie or a non-Catholic celebrating St. Patrick's Day. You don't have to believe in a doctrine to be happy and rejoice and wish for peace to your fellow man.
But you do have to be a JW to be a real Scrooge and rotten and judgmental and think you are better than everyone else.
There's an old saying: "When in Rome, do as the Romans do." There's a new saying too: "Read the room."