Well, since this is a porn site and not a theological one, I really shouldn't write this and I apologize in advance if I hurt anyone's sensibilities.
To celebrate Christmas or sabbath (or anything else) is a tradition. There is nothing wrong with it, but it hardly have any spiritual significance.
How you dress, what customs you observe and similar belong to a mortal world, nothing eternal about it, it will cease to exist with time, by it years or millennia.
So what is truly spiritual in a human?
Not to go at depth, Jesus spoke that only path to God is through love. Also, he said many times not to fear. I stated this simply to compare it to what is told in most churches.
This is a complex topic, so I can't give all arguments in short message, but I don't think it's not fair to divert this thread from a game, so I'll stop here.