Yup. It’s exactly the back-of-the-head assumptions that are the problem.
Good luck, though, Kimstu. We appear to be dealing with somebody who can’t tell the difference between saying that angels are a Christian religious symbol and saying that Christians worship tree ornaments.
That is just plain not true. (Maybe it is in, say, Japan. That I don’t know. But it is most certainly not true in the USA.)
Because people buy Christmas presents doesn’t mean they’re not also celebrating a religious holiday.
I think you’re one of them.
And the major flaw in it.
Categorization is useful for some purposes. Thinking that because it’s useful for some purposes those nice neat lines actually exist, and that they couldn’t just as well be drawn in other places or removed altogether for purposes for which that’s more useful, is a problem.
Can’t be done.
U.S. history does not exist in a vacuum, separate from all the rest of the world.
Now because in a given year’s course of study (or a lifetime’s, for that matter) it’s not possible to discuss all at once everything that ever happened everywhere in the world, particular courses concentrate on a selection. But by its very nature, such selection leaves things out. It’s necessary to do so, but it’s also necessary to realize that this is happening, to recognize that to some extent the lines being drawn are arbitrary, and to re-evaluate from time to time what the selection for a given course ought to be.