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Many scholars describe Shinto as a religion, a term first translated into Japanese as shūkyō around the time of the Meiji Restoration. Some practitioners instead view Shinto as a "way", thus characterising it more as custom or tradition, partly as an attempt to circumvent the modern separation of religion and state and restore Shinto's historical links with the Japanese state. Moreover, many of the categories of religion and religiosity defined in Western culture "do not readily apply" to Shinto. Unlike religions familiar in Western countries, such as Christianity and Islam, Shinto has no single founder, nor any single canonical text. Western religions tend to stress exclusivity, but in Japan, it has long been considered acceptable to practice different religious traditions simultaneously. Japanese religion is therefore highly pluralistic. Shinto is often cited alongside Buddhism as one of Japan's two main religions, and the two often differ in focus, with Buddhism emphasising the idea of transcending the cosmos, which it regards as being replete with suffering, while Shinto focuses on adapting to life's pragmatic requirements. Shinto has integrated elements from religions imported from mainland Asia, such as Buddhism, Confucianism, Taoism, and Chinese divination practices, and shares features like its polytheism with other East Asian religions.

Some scholars suggest we talk about types of Shintō such as popular Shintō, folk Shintō, domestic Shintō, sectarian Shintō, imperial house Shintō, shrine Shintō, state Shintō, new Shintō religions, etc. rather than regard Shintō as a single entity. This approach can be helpful but begs the question of what is meant by 'Shintō' in each case, particularly since each category incorporates or has incorporated Buddhist, Confucian, Taoist, folk religious and other elements.

— Scholar of religion Brian Bocking

Scholars of religion have debated how to classify Shinto. Inoue considered it part of "the family of East-Asian religions". The philosopher Stuart D. B. Picken suggested that Shinto be classed as a world religion, while the historian H. Byron Earhart called it a "major religion". Shinto is also often described as an indigenous religion, although this generates debates over the different definitions of "indigenous" in the Japanese context. The notion of Shinto as Japan's "indigenous religion" stemmed from the growth of modern nationalism between the Edo and Meiji periods; this view promoted the idea that Shinto's origins were prehistoric and that it represented something like the "underlying will of Japanese culture". The prominent Shinto theologian Sokyo Ono, for instance, said kami worship was "an expression" of the Japanese "native racial faith which arose in the mystic days of remote antiquity" and that it was "as indigenous as the people that brought the Japanese nation into existence". Many scholars regard this classification as inaccurate. Earhart noted that Shinto, in having absorbed much Chinese and Buddhist influence, was "too complex to be labelled simply indigenous religion". In the early 21st century it became increasingly common for practitioners to call Shinto a nature religion, which critics saw as a strategy to disassociate the tradition from controversial issues surrounding militarism and imperialism.

Shinto displays substantial local variation; the anthropologist John K. Nelson noted it was "not a unified, monolithic entity that has a single center and system all its own". Different types of Shinto have been identified. "Shrine Shinto" refers to the practices centred around shrines, and "Domestic Shinto" to the ways in which kami are venerated in the home. Some scholars have used the term "Folk Shinto" to designate localised Shinto practices, or practices outside of an institutionalised setting. In various eras of the past, there was also a " State Shinto ", in which Shinto beliefs and practices were closely interlinked with the Japanese state. In representing "a portmanteau term" for many varied traditions across Japan, the term "Shinto" is similar to the term " Hinduism ", used to describe varied traditions across South Asia.