The unit of currency is the yen. It may seem a little odd that when you add all the self professed Buddhists, Shintoists, Christians, and people of other religious denominations, the population of Japan appears to have doubled. But there is a practical reason for this. It is not unusual for the same family to celebrate birth with Shinto rites, have a Christian marriage, and pay last respects with a Buddhist ceremony. Japanese have long held a tolerance for varieties of religion.
Freedom of worship is guaranteed by law.