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Shintoism, which is indigenous to Japan, and Buddhism, which was introduced to Japan in the sixth century, are the two main religions in Japan. Many Japanese practice both religions, celebrating birth and marriage in accordance with Shinto rites while following Buddhist ceremonies for funerals and memorial services. Shintoism, which originated as a way of dealing with ancient people's fears of demons and the supernatural, has no written doctrines. A Shinto place of worship is referred to as a shrine. The Buddhist place of worship is a temple. Freedom of religion is guaranteed to all by the constitution.