There are two main religions in the Japanese society: Shintoism and Buddhism. Spirituality and where they belong are not exclusive, therefore the vast majority of Japanese people naturally identify to these two.
This is even more true since the religious presence is an integral part of daily life in Japan, starting by the uncountable number of temples and shrines. Therefore, from a very young age until their death, Japanese people worship Buddha and Kami (Shinto gods) depictions throughout numerous rites and traditions.
Whereas since the 1970s, Japanese people were mostly only Shintoist, in 2015 there was an equivalent number of believers of the two religions: about 89 millions for each of them.
We also count about 2 millions of Christians as well as a minority of Muslims and Jews in Japan.