Christianity the world's largest religion: almost a third of the population describe themselves as Christian. Over 2000 years since it first started, no other religion has had such cultural and global impact and millions today claim their lives are completely changed by their decision to be a Christian. But what is a Christian and how do you become one? What do Christians actually believe and how does that impact their everyday life? As an introduction to Christianity or a refresher course in the essentials, Christian Basics is a concise but comprehensive guide.