What is the Gospel? is a nonfiction factual book. If you like learning both sides of controversial topics, then this book is for you. It talks about Christians' perception of the Gospel and it shows how non-Christians view it as well. There are many facts and chapters full of information in this book and that sometimes slows it down a bit but it is uniquely written nonetheless.
Greg Gilbert also writes about what the Kingdom of God is and the differences between what people think it is. This enables you to draw an illustration of all sides as to how the Kingdom of God is portrayed. No matter your religion, if you like learning about other religions and beliefs, then this book is for you.