The concept of Hellenistic religion as the late form of Ancient Greek religion covers any of the various systems of beliefs and practices of the people who lived under the influence of ancient Greek culture during the Hellenistic period and the Roman Empire (c. 300 BCE to 300 CE). There was much continuity in Hellenistic religion: people continued to worship the Greek gods and to practice the same rites as in Classical Greece.
Change came from the addition of new religions from other countries, including the Egyptian deities Isis and Serapis, and the Syrian gods Atargatis and Hadad, which provided a new outlet for people seeking fulfillment in both the present life and the afterlife. The worship of deified Hellenistic rulers also became a feature of this period, most notably in Egypt, where the Ptolemies adapted earlier Egyptian practices and Greek hero-cults and established themselves as Pharaohs within the new syncretic Ptolemaic cult of Alexander III of Macedonia. Elsewhere, rulers might receive divine status without achieving the full status of a god and goddess.
Many people practiced magic, and this too represented a continuation from earlier times. Throughout the Hellenistic world, people would consult oracles, and use charms and figurines to deter misfortune or to cast spells. The complex system of Hellenistic astrology developed in this era, seeking to determine a person's character and future in the movements of the sun, moon, and planets. The systems of Hellenistic philosophy, such as Stoicism and Epicureanism, offered a secular alternative to traditional religion, even if their impact was largely limited to educated elites.