When we celebrate our birthdays we don't open up the photo albums, gather around and coo over "the baby". We want people to relate to us as we are. Why would Jesus want it any differently than we do?
Typically the person being celebrated is in the room and everyone is aware of their age. I can imagine some parents reflect back on the day their child is born, look at their photos and review all the events that took place that day especially if there was something particularly traumatic that happened. I know I do.
Again, Christmas is based around the miraculous birth of the son of God and the events that took place at that time. There are other holidays and customs that highlight important aspects of his adult life. I don't think you're truly concerned about anyone being confused about Jesus still being a baby or that somehow he'd disapprove. The feeble arguments you present come across as attempt to nit pick and grasp at straws in order to feel more knowledgeable and or virtuous .
As the Israel of God, His people are called out of the world. We're to separate ourselves as a holy nation unto God...following Jesus and worshipping in spirit and truth.
That was the nation of Israel and God ended that arrangement because it failed miserably. They were an actual nation of people long before Jesus arrived so they weren't even following Jesus much of the time. JW's somehow dare to call themselves spiritual Israelites even though as far as I know, there was no indication that Christians were to view themselves as an actual nation, spiritual or otherwise.
It is solely a tradition of men. God is not obligated to honour our feelings about "why" we celebrate christmas and He's not obligated to honour the traditions of men. Since December 25th isn't Jesus' birthday, it's even less likely that God honours the christmas celebration with His approval.
Who said anything about God being obligated to honor our feelings or traditions and how is it that you presume know so much about what he approves or disapproves of that you can criticize and or condemn other peoples customs? As JW's we sang bible based songs several times during each of the meeting just like the hymns in the churches of Christendom. That was a man made custom that was intended to honor God rather than something God required. Who knows if he approved of it or not? Hopefully he saw it for what it was...humans trying to please him.
It seems to me that when it comes to religion we are all guessing at just about everything and it is likely that we are all completely off track. I figure it's best not to criticize other people's religious customs especially since God (if he even exists) is probably shaking his head at everyone's attempts to figure out what he wants. The important thing, (if any of it truly happened) is that 2018 years after his death, people still know who Jesus was.
My father passed away and isn't here to speak for himself but I can't imagine my brother or my sisters being so presumptuous as to claim that they knew him better or that he approved of them more or that their relationship with him and attempts to honor him are superior to mine.
I just don't understand the superior attitude some people have about their religious beliefs and what God supposedly wants or approves of. They act as if they have it all figured out and have a special "in" with God and or mock or condemn anyone who thinks differently than they do. This is why I want nothing to do with religion and more often than not, religious people.