What is a religion, anyway? Are religious beliefs merely a matter of personal taste, or are there rational arguments for and against them? How do religious explanations differ from scientific ones - and in what ways are they similar? The author Winfried Löffler explores such questions in an engaging and didactic manner. Key aspects include: a) explanations of terms and distinctions, b) arguments for and against the rationality of religious beliefs along with their critical examination, c) investigations into the rational structures within a religion.