Explanation:
Two days ago, I biked my first outdoor imperial century (AKA over 100 miles), but didn’t immediately take a picture of my watch displaying the data as I usually do.
Today, I tried to access it and found out that the watch deletes all data weekly and considers Sunday the first day of the week.
What it has to do with Christianity:
It makes absolutely no sense to consider Sunday the first day of the week rather than Monday. Unless you follow stupid standards established by people who consider the last day of the weekEND holy and thus want to give it pride of place as the starting day rather than the final day of the week.
In many languages the days are numbered, e.g. “First day”, “Second day”, …, “Seventh day”. Speakers of those languages have no question about when the week starts.
https://en.wikipedia.org/wiki/Names_of_the_days_of_the_week#Numbered_days_of_the_week
Notably, the older languages start the week on Sunday. Some of the languages that start the week on Monday can be attributed to mistranslation from the former group. So starting the week on Sunday is historically more correct.
Disclosure: I speak a language that starts the week on Sunday, so I’m biased.