I have great respect for many anthropologists who have written about Japan.
There is one point on which they are all wrong. In fact all of the reference materials to Japan and religion are wrong. Japan is supposed to be organized around two religions: Shinto and Buddhism. Shinto is recognized as the main religion involved in marriage and Buddhism is a religion involved in death.
While the Japanese have many Shinto and Buddhist temples and buildings that appeared to be a combination of both, most daily behavior that resembles religious behavior is unrelated to the temples. Religious behavior is a mixture of gratitude toward rocks, food, society, icons and natural objects.
I have been going to Japan in the spring, lately. I can state without qualification that the religion of Japan is the worship of cherry blossoms.
All government and business calendar budgets, all graduations, all official vacations are tied to cherry blossom season.
At cherry blossom time, the entire Japanese society, worldwide, goes to view and celebrate blooming cherry trees. The pink of cherry blossoms is incorporated into every imaginable commercial product and retail festivity. People have parties and picnics associated with the cherry trees. There are many seasonal foods including cherry blossom ice cream.
The religion of Japan is cherry blossoms. Go there sometime at cherry blossom time and see for yourself.