Sokka gakia only chant/recite lotus sutra?
Soka Gakkai don't chant lotus sutra, they only chant Namu Myoho
Renge Kyo, as far as I know.
http://en.wikipedia.org/wiki/Daimoku
Nam Myōhō
Renge Kyō (南無妙法蓮華經, also, in some
schools Namu Myōhō Renge Kyō; Devotion to
the Law of the Lotus Flower Scripture) is
a mantra that is chanted as the central
practice of all forms of Nichiren Buddhism. The mantra is
referred to as Daimoku (題目, title; also,
in some schools, O-daimoku: お題目) and was first
revealed by the Japanese Buddhist teacher Nichiren on the 28th day of the fourth
lunar month of AD 1253 at Kiyomizu-dera (also, Seichōji)
near Kominato in
current-day Chiba, Japan. The practice of chanting the daimoku is
called shōdai (唱題). The purpose of chanting
daimoku is to attain perfect and complete awakening
(enlightenment).
As Nichiren explained the mantra in his "Ongi Kuden" (御義口傳), a
transcription of his lectures on the Lotus
Sutra, Namu or Nam (南無)
derives from the Sanskrit namas,
whereas Myōhō Renge Kyō is the Japanese
pronunciation of the Chinese title of the Lotus Sutra in the
translation by Kumārajīva (hence, daimoku).
Nam(u) is used in Buddhism as a prefix expressing
the taking of refuge in a Buddha or similar
object of veneration. In Nam(u) Myōhō Renge Kyō, it represents
devotion or conviction in the Mystic Law of Life as expounded in
the Lotus Sutra, not merely as one of many scriptures, but as the
ultimate teaching of Buddhism, particularly with regard to
Nichiren's interpretation.
The Lotus Sutra is held by Nichiren Buddhists, as well as practitioners of the
Chinese Tiantai (also, T'ien T'ai)
and corresponding Japanese Tendai sects, to be the culmination
ofShakyamuni Buddha's 50 years of
teaching. These schools view the phrase Myōhō Renge
Kyō as the distillation of the entire sutra—for them, all
the sutra's teachings are summarized in its title. By extension,
followers of Nichiren Buddhism also consider Myōhō Renge Kyō to be
the name of the ultimate law permeating the universe.
Broken down, Myōhō Renge Kyō consists
of Myōhō (妙法), "sublime," "unfathomable" or
"mystic" law, the Dharma underlying all
phenomena; Renge (蓮華), the Lotus Flower, which blooms and bears seeds
at the same time and therefore signifies cause and effect;
and Kyō (經, "thread passing all the way through
a bolt of cloth", but also "scripture"), meaning a teaching of the
Buddha.
The seven characters na-mu-myō-hō-ren-ge-kyō are
written down the centre of the Gohonzon, the mandala venerated by most Nichiren
Buddhists.
Precise interpretations of Nam(u)-Myōhō-Renge-Kyō, how it is
pronounced, and its position in Buddhist practice differ slightly
among the numerous schools and sub-sects of Nichiren Buddhism, but
"I take refuge in (devote or submit myself to) Myōhō Renge Kyō"
might serve as a universal translation.