Moon-o-theism is a two volume 1100+ page book by Yoel Natan. ISBN 1-4116-0106-8 and ISBN 1-4116-1765-7. The full text of this book is available on books.google.com (see the links above.) The main idea of this book is that the god of Islam is a moon and war god of ancient Arabia. This is not the generally accepted idea that most Muslims would have about their faith. The book appears to be the result of a massive amount of research as there are 4800+ footnotes and references to other books. The author finds it difficult to contain his sarcasm, however, frequently referring to academics that he disagrees with as "acaDhimmis". (See wikipedia for a description of a dhimmi.)