That does explain why they did it.

Although that doesn't explain why
we're still doing it. Oh, well.
You see, that's actually another reason it should be changed or removed from the standard calender. I actually find it mildly offensive that I have religion thrown in my face every time someone talks about what day it is. So it's not only arbitrary, poorly labeled, and difficult to keep track of, it's rather offensive to people who don't share the religion of the people who invented it. It's one thing for religious people to want it, but why should the rest of us be subjected to it when we're trying to figure out when something happens?
Hmm... everything else can be justified based on how people had to tell time in the past, in my mind, but I firmly believe that the week is a truly
awful unit of time.