The Eternal Sakyamuni Buddha is no one else than the Historical Sakyamuni Buddha. Prince Siddhartha attained enlightenment and became a Buddha. He was called Sakyamuni because he was the muni (sage) of the Sakya Clan. He had a birthday and Parinirvana day. All this is a historical fact. But the same Buddha announced in Chapter XVI of the Lotus Sutra that he is eternal. He says that he appeared in this world as the Historical Buddha in order to save all living beings. The Eternal Sakyamuni is the same of the Historical Sakyamuni in his eternity. The Historical Sakyamuni is the name of the Eternal Sakyamuni in his historicity. To separate the Eternal Sakyamuni from the Historical Sakyamuni will destroy Buddhism. The fundamental teaching of Buddhism is that a human became a Buddha and that a Buddha was once a man. Christ worshiped God; Mohammed, Allah. But the Buddha worshiped no one but himself in his eternity.

You can become a Buddha provided that you are forever a disciple-Bodhisattva of the Eternal Sakyamuni Buddha in faith just as Nichiren is forever a disciple-Bodhisattva of the Eternal Sakyamuni Buddha in faith. You will be allowed to join the Samgha under the Eternal Sakyamuni Buddha, who is still now expounding the Wonderful Dharma on Mt. Sacred Eagle.