I had thought about that. There was this pretty cool movement in France in the early 11th century called the Peace of God which, among other things, made it illegal to wage war on certain days of the week and every holiday. Also, there were yearly rituals, like the Holy Fire which would descend onto the alter in the Holy Sepuchre every Easter in Jerusalem. If I remember correctly, Baldwin of Edessa used a year inwhich the Holy Fire didn't descend to make a claim for kingship in Jerusalem, which he eventually gained. The point is, small things like that can and did have profound impact on politics.
However, such things would be a pain to create. Could you imagine loosing piety for having your army fight on a Sunday? And many holidays follow a lunar, not solar calendar, so it would be hard to implement. It would make for some interesting special events however. Frankly, I would be happy with religion being a bit more important in the game. I feel the Church is too weak and typically stays out of your own business, which it certainly did not do in real Medieval history.
That reminds me!
About the Holy Fire in Jerusalem on Pascha, it is said that while the crusaders had control the Catholics wanted to conduct the "ritual" for the Holy Fire instead of the Orthodox Patriarch of Jerusalem. It is said the
Latin Patriarch of Jerusalem spent all day and night praying and crying for the Holy Fire to appear on the night of Pascha, but it never came. There is also a tradition that when this was done, a lightning bolt (or thunder or whatever it is called) shot and hit a certain pillar close to the seplechure, which made it have a very large crack which can be seen today. That lightning bolt tradition is probably just made up for various reasons with evidence, but I always found these traditions to be fascinating.
I might have recalled all of this wrongly, but I cannot be bothered to serf the internet to try to find it again right now.
ANYWAY, Baseballkrba, do you recall where one can read about Baldwin of Edessa regarding the Holy Fire? Maybe the tradition of the Catholics trying to obtain and failing is with this same instance with Baldwin... ;P
EDIT: Oops! Looks like I confused two traditions with each other. I found this on wikipedia, which will clear a bit up:
The Holy Fire is first mentioned by the pilgrim Bernard the Monk, in 870 AD.[6] A detailed description of this phenomenon is contained in the travelogue of the Russian hegumen Daniil (Daniel), who was present at the ceremony in 1106 AD. Daniel mentions a blue incandescence descending from the dome to the edicula where the patriarch awaits the Holy Fire. Some claim to have witnessed this incandescence in modern times.[7]
During the many centuries of this phenomenon's history, the Holy Fire is said not to have descended only on certain occasions, usually when heterodox priests attempted to obtain it. According to the tradition, in 1099, for example, the failure of Crusaders to obtain the fire led to street riots in Jerusalem[citation needed]. It is also claimed that in 1579, the Armenian patriarch Hovhannes I of Constantinople prayed day and night in order to obtain the Holy Fire, but lightning miraculously struck a column near the entrance and lit a candle held by the Orthodox patriarch of Jerusalem Sophronius IV standing nearby.[8] Upon entering the temple, the Orthodox Christians would embrace this column, which bears marks and a large crack that they attribute to the lightning bolt.
In 1969–1970, the Orthodox patriarch of Jerusalem Benedict introduced the Revised Julian calendar prompted by the Geneva-based World Council of Churches, which changed the calculation of the date of the event. That same year, the Holy Fire did not appear at the Holy Sepulchre. The original ecclesiastical chronology (the Eastern Orthodox Church calendar) with the original calculation of the date was immediately restored, and the Holy Fire recommenced appearing the following year and thereafter.[9][10]
On May 3, 1834, the Church was so packed that a stampede caused four hundred deaths, with the governor Ibrahim Pasha of Egypt saved by his guards' swords slicing a way out, as reported by Robert Curzon.[11]
On April 26, 1856, James Finn watched Greek pilgrims battling Armenians with concealed sticks and stones. The pasha had to be carried out before his soldiers charged with fixed bayonets.[12]