The New testament has 27 Books
The Gospels consists of 4 Books: Matthew, Mark, Luke and John
Acts, has 1 Book.
The Epistles, has 21 Books: Romans, 1 Corinthians, 2 Corinthians, Galatians, Ephesians, Philippians, Colossians, 1 Thessalonians, 2 Thessalonians, 1 Timothy 2 Timothy, Titus, Philemon, Hebrews, James, 1 Peter, 2 Peter, 1 John, 2 John, 3 John, Jude
The Book of Revelation has one book:
In chapter 2 and 3 the Lord chastises seven churchs, but doesn’t go into detail of the wrong doings. The rest of the book is much in figurative speech. There are prophecies of things to come. Many give up on this book, but it was written for a reason and can help of what has happened to the church and things to come.
Revelation 22 verse 18 and 19 are two commands for all to take notice, not to add to this book or take from it. Since Revelation is part of the New Testament these two verses applies to all the books in it.
Unfortunately unscriptural churches are in the massive thousands for not heeding to these two command