This document provides an overview of major belief systems of the classical period, including Hinduism, Judaism, Zoroastrianism, Buddhism, Greek Rationalism, Confucianism, Daoism, and Christianity. It discusses their origins, core beliefs around existence after death, how they challenged social hierarchies and appealed to lower classes, spread through missionaries and trade routes, and changes as they spread to new regions. Buddhism and Christianity in particular challenged social class systems and women's roles, and spread through monastic orders and missionaries taking the religions' messages to new areas.