From Bethlehem to the Vatican is written for readers who sense that Christianity matters, yet find themselves without the basic tools to understand it. Religion, as this book argues, is neither a relic nor a simple force for good or evil. It has shaped lives, cultures, and entire civilizations, inspiring care and creativity while also justifying oppression and violence. To grasp Western society – its laws, ethics, art, politics, and stories – one must grasp the Christian narrative that has so profoundly informed it. This book offers a deliberately modest but ambitious response to widespread religious illiteracy in the secularized West. It does not presume prior knowledge, personal faith, or a desire for religious initiation. Instead, it provides an intellectual initiation: a clear, accessible, and academically responsible introduction for those who want to understand Christianity without being overwhelmed by theological jargon or massive scholarly tomes. It explains the Bible, Jesus Christ, Church structures, rituals, sacraments, ethics, and theology, while also addressing Christianity’s darker chapters and ongoing controversies.