Though Zen is more well-known in the West, it is the Jodo Shinshu sect of Pure Land Buddhism which is the most widely practiced in Japan.
Jodo Shinshu was founded by Shinran Shonin, who left the monastic life to get married and have children.
After many years of trying to attain Buddhahood by his own efforts, Shinran came to the realization that the Nembutsu alone is all one needs.
Shinran understood Amida as Dharma-body itself, the ultimate source of all Buddhahood.
In chanting the Nembutsu, Namu-Amida-Butsu, we gratefully await our future rebirth into the Pure Land, the realm of Nirvana.