There are three primary books as the "Sangenten" that Tenrikyo references. Two of the books were written by the founder, Miki Nakayama:
The third scripture, the Osashizu, is a compilation of all of God's oral revelations delivered through Oyasama and Izo Iburi which is actually a total of 7 large volumes and nearly 20 thousand revelations.
There are also three supporting scriptures known as Jungenten, which are the fundamental explanations of the teachings.
There is no "holy book" of Tenrikyo, however, there are three scriptures that contain the fundamental descriptions of the Tenrikyo teachings. The following books are referred to as the Three Scriptures (Sangenten 三原典).Ofudesaki (The Tip of the Writing Brush)Mikagura-uta (The Songs for the Service)Osashizu (The Divine Directions)Other texts that are not referred to as scripture yet also fundamental in learning the teachings of Tenrikyo are collectively known as supplementary texts (jungenten 準原典).The Doctrine of Tenrikyo (天理教教典)The Life of Oyasama (稿本天理教教祖伝)Anecdotes of Oyasama (稿本天理教教祖逸話篇)
There is no "holy book" of Tenrikyo, however, there are three scriptures that contain the fundamental descriptions of the Tenrikyo teachings. The following books are referred to as the Three Scriptures (Sangenten 三原典).Ofudesaki (The Tip of the Writing Brush)Mikagura-uta (The Songs for the Service)Osashizu (The Divine Directions)Other texts that are not referred to as scripture yet also fundamental in learning the teachings of Tenrikyo are collectively known as supplementary texts (jungenten 準原典).The Doctrine of Tenrikyo (天理教教典)The Life of Oyasama (稿本天理教教祖伝)Anecdotes of Oyasama (稿本天理教教祖逸話篇)
Tenrikyo followers are called "Tenrikyo followers." In Japanese, 天理教の信者 (tenrikyo no shinja). Derivations of the name Tenrikyo is never used (i.e. Tenrikyoians, Tenrikyoites, etc.).
There are no food restrictions followed by Tenrikyo followers; at least none are explicitly defined in any Tenrikyo texts or scriptures. Source: myself
The holy book
Not all holy book are the same , the best holy book is the BIBLE
Holy book for Parsis or Zorastrianism is Avesta.
The holy book of Sikhs is Gurugranth Saheb.
There is not a secular holy book, that would be an oxymoron.
Yes. The holy book of Christianity is the Bible.
Quran is the Muslim holy book
The Torah is the holy book of Judaism.