Happy Holiday VS Merry Christmas_2022

Why do people prefer to say Happy Holiday not Merry Christmas?
There are some religious reasons.

Some religious believers are very strict with Christmas Day, for example Muslim don’t celebrate Christmas Day.

Meanwhile, in December, there is not just Christmas Day. Judaism celebrates

Hanukkah, which usually starts between late November and late December.

In order to avoid some affairs, people tend to say “Happy Holiday'' rather than “Merry Christmas”. Because you don’t know other people’s beliefs.