One of the wicked priests of King Noah is a man named Alma, who is a descendant of Nephi. When first introduced in the Book of Mormon, Alma is a young man in the process of being converted by Abinadi. (Mosiah 17:2.) Much of the religious history of the Nephite nation for the next three hundred years is concerned with this man and his descendants. Alma not only begins a religious revival among his own people, but later he is given power by King Mosiah to establish churches throughout all the land of Zarahemla. (See Mosiah 25:19.)
Still later we read that Alma’s son (also called Alma) succeeds his father as the religious leader of the people and also becomes the first chief judge over the Nephite nation. Other descendants of Alma the elder who become great religious leaders of the Nephites include his grandson (Helaman); great-grandson (Helaman, the son of Helaman); great-great-grandson (Nephi, the son of Helaman who is the son of Helaman); and great-great-great-grandson (Nephi the second, who is also the chief disciple of the resurrected Jesus Christ). Abinadi may have felt that he had failed as a missionary; so far as the record indicates, his only convert was Alma. However, as mentioned above, the missionary efforts of Abinadi affected the religious life of the Nephites for hundreds of years.
(Daniel H. Ludlow, A Companion to Your Study of the Book of Mormon, p. 187)