A lot.
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There are presently around 4 million people who follow the belief of Shinto.
Shinto
Shinto is indeginous to Japan, therefore it has many believer's within Japan, but there are a select handful who follow this faith, living outside Japan.
"Kami" "Kami"
There are 2.7 million Shinto followers in the world today. : ) Technicaly there is 2. 9 million because most people that follow shintoism are also buddist. {-_-} (_@_)
The two main religions are Buddhism and Shinto
There are presently around 4 million people who follow the belief of Shinto.
Shinto is the traditional religion of Japan, though Japan is mainly responsible for the development of Zen Buddhism. Buddhism and Shinto are the two largest religions of Japan - though many follow both religions and visit the temples of both.
There are two main branches. Secretarian Shinto (which sub divides into 13 more branches) and State Shinto Religion.
Japan is mainly Buddhist and Shinto, but that doesn't mean there are no Christians, Jews, Muslims, etc, whether Japanese or of foreign origin.
If you are going to travel to Tokyo you will want to see the Shinto shrine, Yoyogi Park, and Shinjuku Gyoen National Garden. Nihonbashi is a commercial and shopping district that will be a fun area to stay in.