Mostrov wrote:-snip
Regarding the religion bit, I think that referring them by exonyms, at least partially, is actually more common than otherwise. It seems to be more common for religions that are first contacted and documented by the relevant cultures of said language (in this case, English) during the medieval age and before, with indigenous names becoming increasingly common in later times. Examples of such being Buddhism (but not of the denominations, unlike ones of Christianity), Zoroastrianism and maybe the old pagan religions of Europe when they bother to give them specific names (the old name of Islam, Mohammedanism, might count as well although it has since fall into disuse because of allegedly being offensive for theological reasons). For partial examples, Taoism or even Shintoism might count as well, as they are based on the native name of the religion, but with the suffix of "-ism" to notate its nature. As Kamism was not organised or christened ( ) with an official name until long after it has established contact with most foreign cultures concerned, I believe that it is reasonable to think an English-speaking culture would name it after the most common element (Kami) and add "-ism" behind.
In any case, the native name is probably something along the line of kami-no-wosihe, which is quite a nuisance to type, to be frank, and it does not look as brief and elegant as the current exonym, so I would prefer not to change it as long as it makes some kind of sense.
For the feudal part, I have been thinking about it for a while, but sadly not many results were yielded. I agree with your statement that a feudal system is largely incompatible with modern society, perhaps evident by the fact that they do not exist any-more in large scale in modern world in RL. However, as it is one of the cornerstones of my nation, I think I will try to preserve it as much as possible, even if only by-name.
I think that the feudal system, or a semi-feudal system that resembles more of the nobility renting the land to the peasants in exchange of the product and/or money, is probably still alive and well in the agrarian part of the nation, as few has changed for centuries, even millennia for them.
Things are a lot more complicated in the urban environment, especially if it is to maintain the position of spearheading the modernisation and economy of the realm. What I am thinking of is to retain the feudal system by name and laws only, with the nature of the governance resembling more of some sort of local rule. Essentially, the nobles who once owned the land that composed of the modern city still own the land de jure. However, it has since evolved into a system of renting, or selling the rights to use said land to merchants, guilds and industrialists alike in exchange of money (or if that fails, "products" will do as well). Similar to what is probably a federated/con-federated system, the nobility can also make their own law, set their own tax rate and whatnot in their own realm as long as they do not contradict the law of their superior lieges, as well as paying tax to them. Supposedly, in order to maximise profit, many nobles also operate companies that provide essential service in their realm, sometimes even mandating monopoly on said service if they see fit, creating a lot of corporate towns in the process.
I hope it makes a bit more sense (or at least enough to make it plausible to survive, even with suboptimal efficiency), but I am taking medication now and my brain is a bit fuzzy. Sorry about that.