The term “best god book from horror from the deep” is not a well-defined concept. It is possible that you are referring to a specific book or series of books, but without more information, it is difficult to say for sure. However, I can provide some general information about horror books and the concept of gods in horror.
Horror books often explore the darker side of human nature and the supernatural. They can be used to scare readers, but they can also be used to explore important themes such as good and evil, life and death, and the nature of reality. Gods are often used in horror books as a way to personify these themes and to create a sense of awe and dread.