Adding a holiday is obviously a red line to cross, or too difficult. I suspect any percentage of Jews in the early 20th century would not have made any western country adopt their holidays as western holidays. After all, you will admit that anti-semitism was rife in North America in the early 20th century. It is a primary reason Jewish refugees were not allowed into Canada/USA before and during WW2.

So that is why I had suggested removing all religious holidays. I don't care about any religious holiday. But there are people who do, and they forced to adapt. I have a Sikh friend, and her kids (she and they were born in Canada) know more about Christianity than Sikhism. My friend isn't religious, and doesn't care. But plenty of people who are non Christian will hold tighter to their religion and culture. Does that explain radicalism among some of the first and second generation immigrant? As I pointed out earlier, that is the reason for the large number of ISIS members from the west.