An excellent thinking-man's sci-fi novel. This is not a ray-gun, beam-me-up, space-ship romp type of novel. It examines what it means to be human and finite in an almost infinite universe.
I tend to be attracted to books that combine religion and science fiction -- possibly because they're so rare, science and religion being two subjects that rarely overlap. This was different even within that narrow sub-category, because it dares to ask exactly what God really is, and then goes out to look for Him and make direct contact.
However, it doesn't get to do that before going through the motions. Much of the first half of the book involves two main characters revisiting most of the better-known arguments for an intelligently-designed universe, and if you've spent any amount of time studying those before reading this book you might find them time-consuming. Even so, a good read and an interesting angle on a question as old as humanity itself.