The point is that no one knows what *the author thinks* it's about. It means different things to each reader. I found it a fabulous cross-discipline primer in structured thought when I first read it at 17. I didn't take out if it the same theological or metaphysical concepts that others found.
In later readings, I have focused on other aspects of the book. No matter how you read or interpret it, GEB is a fabulous read, and will stimulate your thinking.