What is the native metaphysical outlook of Japan commonly referred to as?

The native metaphysical outlook of Japan is referred to as Shinto. Shinto, which translates to "the way of the gods," encompasses Japan’s indigenous spirituality and practices centered around the reverence of kami, or spirits associated with natural elements and ancestors. It is characterized by rituals, shrines, and festivals that emphasize harmony with nature and community.

Shinto has deep historical roots in Japan, reflecting the relationship between the people and their environment, and plays a fundamental role in Japanese culture, rituals, and identity. It is distinct in that it does not have a founder, sacred texts comparable to other religions, or organized doctrines, making it an ethereal and experiential tradition.

The other options refer to different belief systems: Tao pertains to Chinese philosophy and religion emphasizing harmony, while Hindu describes a major religious tradition originating in India, and Sunni refers to a branch of Islam. Each of these traditions has its own unique practices and ontologies, distinct from the Shinto outlook that is specifically native to Japan.