Did you know that celebrating birthdays, which in ancient Greece and Rome you did for a "god" or "emperor" (who wanted to be worshiped as a god) was considered a PAGAN practice by early Christians?
Did you know that in some middle eastern cultures they still don't celebrate birthdays?
Now do you understand why Jesus birthday celebration wasn't something the people living in Rome who knew Christ cared to do. Mary was alive and the most likely source of Luke's gospel which has the whole infancy narrative of Jesus. If he interviewed her, the woman who give birth to the man (even if you think he was an ordinary man) do you think Mary carried a calendar around?
But birthdays are no longer considered pagan (itself an interesting, catch-all word to make all non-Abrahamic faiths sound scary and inaccessible) and though they frequently turn into displays of self-worship the culture at large is not doing it as a religious or spiritual ritual
No longer pagan, yes, but at the time of the early Christians it was pagan.
Indeed. I was just testing to see if this was some kind of Jehovah's witness propaganda