Primitive dogmatism of religion. The capitalism of traditions is terrible too. I have never celebrated it in my life, so whatever from that perspective. As the outsider watching the nonsense, it looks insane, and the way it leads to suicide season in the first quarter that follows is like watching people punch themselves in the face every year. The date of Jesus's birth is not recorded biblically either. So the entire thing is nonsense and a carryover of far more ancient traditions. Not to mention there is no actual evidence Jesus ever existed. The gospels were written several decades later, and contain lots of errors and copying mistakes like cheating school children if you actually do research into the oldest manuscripts. What remarkable event do you recall accurately several decades later after your entire world is destroyed and you are living in a foreign land as a noncitizen and hated by pretty much everyone around you. You might be able to survive on the tribalistic dogma of the successful few among the diaspora if only you could find a way to sate their desire to believe in something greater than themselves. Even then, no one really cared for nearly three centuries until it became a thing. It was a convenient way of consolidating political power in an age when religion was inseparable from politics and anyone could start some random cult religious movement to gain power. Monotheism made it much harder to use religious populism for power. So I see it as spurious harmful nonsense from top to bottom and every level in between.