Easter is not on a weekday, but the entire week we got off for "Spring Break". Which, not coincidentally, overlaps with Easter. Unless you can think of another reason that week specifically should be free of schooling?

The secular side of Christmas? Maybe in Europe, but here in the US, Christmas is still a very religious holiday. To the point where saying "happy holidays" to more than 10 strangers in December will likely be met with at least one "It's Merry Christmas" from a Christian who feels oppressed. Speaking as someone from a Jewish family who worked in customer service for many years, Christmas had no secular aspects; we could easily have called it "Movie Day" in my family and it would be accurate.

You're right that we don't get the smaller Christian holidays off. I'm not saying "we get all Christian holidays off", I'm saying "the only religious holidays we get off are Christian". Not all rectangles are squares, but all squares are rectangles.