This textbook offers a brief overview of the basic approaches to the scientific scrutiny of religion. To remain uninterested in examining religion is more difficult than examining any other object of research. In relation to issues of religion, we cannot stand as impartial observers, because we are always somehow involved. Therefore, this book emphasizes not only knowledge of religions, but also how to find ways to get closer to impartiality. It offers an overview of topics, questions, and context, rather than a coherent theory.