- Hellenistic religion developed under Greek cultural influence between 300 BCE to 300 CE and combined Greek and foreign religious practices. The major new religions included the Egyptian cults of Isis and Serapis which provided fulfillment in life and afterlife. Ruler cults also developed where monarchs received divine status. Magic, astrology, mystery religions, and philosophical systems like Stoicism and Epicureanism were widely practiced during this era as alternatives or supplements to traditional Greek religion.