My wife (Japanese) insists that blood type is an accurate way of telling somebody's personality, in spite of my best skeptic attempts to dissuade her of that notion. It is amazing how prevalent the "blood type = personality" belief is there. It is pretty much accepted as common sense.
A lot of Japanese I know also carry around
omamori, a charm sold at Shinto shrines. Omamori are made specifically for various functions, like "traffic safety," "success on exams," "love," etc. The first time I went to Japan (as a student) and saw the Omamori, I figured they were a sort of good luck charm. I was surprised to find out how many people really believed in them, and were afraid to throw one away. I suppose, in the end, it isn't much different than wearing a crucifix or a cross, but nonetheless I was surprised. Japan also has a lot of famous ghosts, including probably the most famous, that of Taira Masakado, who supposedly haunts an area in downtown Tokyo, near Otemachi, where his head his buried. People still leave offerings at the shrine to appease his spirit.
Japan is an odd sort of duck. One of the most developed nations in the world, but also one in which religion pervades nearly every sphere of life, including business and government. It is probably the only developed nation left which still has an "Untouchable" caste. It seems to have joined the industrial world without ever losing it's "dark ages" superstitions.
Interestingly, anywhere from 65-80% of Japanese (depending on the survey you read) will say that they have no particular religion -- which is generally true, in my experience. Most Japanese do not follow one specific religion. There is a kind of joke about Japan that Japanese are Shinto when they are born (they usually go to a Shinto shrine at various specific ages up until they are 20), Christian when they are married (most Japanese have a Christian-style wedding, although the religion aspect is mostly for show), and Buddhist at death (usually they have Buddhist funerals). As I said, a lot of Japanese believe in omamori, which is a shinto artifact. Most Japanese also have a butsudan in their home -- an altar on which they give offerings to their ancestors. My wife's family, and my host family when I studied there, both had one, and would give daily offerings of rice, sake, tea, etc. Ancestor worship is probably the most prevalent "religious" custom in Japan, since it exists pretty much across the board in various forms. Generally, though, most Japanese do not follow one specific religion, but they are definitely
religious in the sense that many follow and believe in a hodgepodge of customs from different religions. It is a very interesting mix, to say the least.
Here in Korea, on the other hand, there are lots and lots of Christians. Statistically, they are supposedly only 25% of the population, but they are everywhere. If you go downtown to any fairly crowded area, there is always a group of Christians singing or reading the bible into a microphone. I even had a couple of "bible students" come to my house the other day.