Shintō doesn't have a supreme being, per se. Rather, Shintō shrines are set up to worship a particular or a few kami(神). The word kami is often (somewhat inaccurately) translated as "god," but it's better to think of them as nature spirits.
Coincidentally, Christianity in Japan translates the concept of one, supreme God as Kami-sama (神様), which is just the word kami plus a suffix indicating great reverence on the part of the speaker - this implies that God is the greatest of all kami.
The word and idea of Kami-sama has no relevance in Shintō, though, because this word is an attempt by Christian missionaries to translate a concept which is foreign to traditional Japanese belief.
Someone who practices Shinto is called a Shintoist or a Shinto adherent.
Shinto is the religion that follows the "way of kami." Kami are sacred spirits in Shinto belief and practices, embodying the elements of nature, natural forces, and ancestors.
Shinto is primarily practiced in Japan, where it is the indigenous religion. It is also practiced to some extent in other countries, primarily where there are Japanese expatriate communities or where Shinto shrines have been established, such as in Hawaii or Brazil.
Atheism questions the existence of a god or supreme being. Atheists typically lack belief in any deities and may express skepticism or disbelief in religious claims.
In Japan, most people will visit Shinto shrines around New Years but not much other than that. Most Japanese people aren't very religious. Only a very small portion of the population would be considered devout. Usually, older people tend to be more devout than younger people. Outside of Japan, it's extremely rare to find anyone practicing Shinto. There are only a couple Shinto shrines in the US, for example.
Kami
Agnostics are in the middle. They see no proof in their being a supreme being and no proof that their isn't a supreme being.
Yoshida Shinto
Shinto is in Japan
God, the creator of the universe. He was and still is the Supreme Being of Judaism.
The followers of christianity calltheir supreme being God.
Shinto was originated in Japan.
a Shinto shrine
Shinto is in Japan
No, they are not. The term supreme being is one way that people refer to concepts of deity. By itself, the word supreme is an adjective that means the highest quality, or most authoritative, or best example of something.
Shinto is a religion of being sincere, putting things in nature on a godly level, and of practicing the ways of ancient Japan, so it is worshipped all the time, wherever the Shinto worshipper is.
A kami is a divine being in the Shinto religion