Even the days of the week have propaganda value in that my forebadgers used names from the old religion...moon-day, tew's-day, wodens-day, thor's-day, and sun-day. When the Romans came in, they made sure one of the Roman gods was mentioned which is why we have Saturn's-day before Sunday.
The seven days corresponding to seven gods (gods of planets) has an interesting history, which I discovered as I started to learn some Asian languages and found that they have the same connection between weekdays and planets that we have in European languages (although the connection with gods is lost). (This connection gets overlooked in English, because we get our day names from the Norsemen and our planet names from the Romans, but compare the French weekday names with planet names, for example.) So I did a bit of digging and discovered that this goes back certainly to the Babylonians, and probably to the Sumerians (and, who knows, maybe they got it from someone else who lived in that area...). From Babylon, the seven day week and its connections with planets went west to Greece, Rome and Northern Europe, and separately east to India, China and the Far East. So, when God made the sun, moon and stars for signs and seasons in Genesis 1, I think he did this for the weekdays too - he made seven weekdays, and seven planets to govern them. ('Planet' means a 'wandering star', because they move with relation to the fixed stars. And hence, the Sun and Moon are planets, while Uranus and Neptune, which are not visible to the naked eye, were not counted.) As to the Romans adding Saturday to the Norse calendar, as I understand it the Norse did not have a god equating to Saturn, and so they borrowed the Roman god to name that day (and maybe that planet). In China, the five visible planets were connected not with gods but with the five elements (as specified in Chinese philosophy): fire, water, wood, metal and earth. And the day names in pre-modern China, as also in modern Korean and Japanese, maintain the connection between the planets and the days (Sunday = Sun, Monday = Moon, Tuesday = Mars, Wednesday = Mercury, Thursday = Jupiter, Friday = Venus, Saturday = Saturn). So the history of the seven day week, rather than being pagan propaganda, is an interesting testimony to God's original design. Of course, pagan societies took the 'signs' and turned them into 'gods' or 'elements'; but they were still using a system created by God and given to Adam
