Revelation is not the revelation of John but rather the revelation of Jesus Christ. He is the theme of the book. What we have in this book is a series of dramas that unfold one after another.
The book begins with this statement:
The Revelation of Jesus Christ, which God gave Him to show His servants—things which must shortly take place. And He sent and signified it by His angel to His servant John, 2 who bore witness to the word of God, and to the testimony of Jesus Christ, to all things that he saw.
In verse 19 we see the outline of the book:
19 Write the things which you have seen, and the things which are, and the things which will take place after this.
The Book Begins with Blessing and Ends with a Word of Warning
In chapter 1 we read the following word of blessing:
3 Blessed is he who reads and those who hear the words of this prophesy and keep those things which are written in it; for the time is near.
The book ends with a grave and sober warning to anyone who would attempt to change the words of the book. In chapter 22 we read,
18 For I testify to everyone who hears the words of the prophecy of this book: If anyone adds to these things, God will add to him the plagues that are written in this book; 19 and if anyone takes away from the words of the book of this prophecy, God shall take away his part from the Book of Life, from the holy city, and from the things which are written in this book.
No other book in the Bible contains this kind of warning which indicates the severity of the warning. Based on the introduction to the book, it is clear that God expects the church to both understand and respond to the book of Revelation. While there can be details in the book of Revelation that we do not have full understanding of, it is clear we are to understand the primary message of the book and respond to it.