This document provides an introduction and overview of Christianity from the book "Studies on Judaism, Christianity and Religions of India" by Dr. Muhammed Dijaur-Rahman el-Adhamij. It discusses how Allah created humanity to worship Him alone and sent prophets to guide people to the true faith and avoid shirk (ascribing partners to Allah). However, over time people deviated from the teachings of the prophets. The document stresses that the original message of all prophets was the same—to worship Allah alone—but religious teachings became corrupted after the prophets.