This means no sales, no themed merchandise, no decorations. December 25 and most other day are treated just like any other day for all stores malls, restaurants, ect.
You’d still get non religious holiday events like mothers days, or independence days.
What whould change?
Except that Christmas is also touching on a consumer activity that isn’t prevalent during the rest of the year, showing others how much you love them with money.
It is a different kind of buying activity than the rest of the year, which is usually purchases for yourself mixed in with some birthday presents.