There are no official estimates as to exactly how many people celebrate Christmas globally, but seeing as there are over 2.1 billion Christians in the world, or about a third of world's population, it is feasible to assume that at least 1 out of every 3 people in the world celebrate Christmas.
the 25th
People who celebrate Christmas usually give presents, yes, but there are many people in China who do not celebrate the holiday because they are not Christians.
Many do, yes. Not all.
Almost all of them.
90% of them
more than 100 people
I don't know how many but there is A LOT
Because many of them are Christians.
Christians in Israel celebrate Christmas in ways similar to those seen in many other parts of the world. Jews in Israel by and large do not celebrate Christmas.
No religion other than Christianity celebrates Christmas as part of their religion. Many people who are not Christians celebrate Christmas, but they celebrate it as a secular holiday, not as a religious one.
About 1.5 Billion people celebrate Christmas. About 14 million celebrate Hanukkah. There are no statistics on the number of Kwanzaa celebrators But it's safe to say that the vast majority of the planet doesn't celebrate any of those 3 holidays.