Such a book or books are said to be "Holy Scripture".
There are different holy books - books considered holy by one religious group or another. Please clarify what specific book you are talking about.
A school operated by a church or religious group is typically considered a religious or parochial school. These schools often incorporate religious teachings and values into their curriculum alongside traditional academics.
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The age group considered young adults when selecting books is typically between 12 and 18 years old.
The founder of the Shakers, as a religious group, was formerly a Quaker. Both Quakers and Shakers use the Bible as their fundamental religious book.
No, Jehovah's Witnesses are not considered Protestant. They are a separate religious group with distinct beliefs and practices.
It is a group of books of the Bible which are accepted by the Roman Catholic Church and most Jews but not by Protestant Churches, including First and Second Maccabees, Tobit and the Wisdom of Solomon. As a result of the Protestant perspective, the word has come to have an extended meaning of works which are alleged to belong to an author, but are dubious.
A religious group can be called a sect. A religious group can also be called a congregation when all attend the same church. A religious group might have more than one sect, or group of individuals, like the Amish.
The biblical canon is the list of books considered to be authoritative. Protestants in particular point to Melito of Sardis, as well as a modernly accepted group of criteria. However, in practice, protestants pull from Jewish canon for the Old Testament, and the Roman Catholic canon for the New Testament.
Another word for religious group could be "faith community" or "religious organization."
A religious cult would be considered a group with extreme or deviant beliefs, a charismatic leader who exerts control over its members, and practices that may harm or exploit followers psychologically, socially, or financially.
A big group of books is called a library.I call a group of books a group of books.