Question: Which religion was one of the earliest practiced religions?
About the article "South Korea", section "Religion".

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The two traditional mainstream religions practiced in Fuzhou are Mahayana Buddhism and Taoism.
Traditionally, many people practice both religions simultaneously.
The city is also home to many Buddhist monasteries/Taoist temples and Buddhist monks.
Apart from mainstream religions, a number of religious worship sites of various local religions are situated in the streets and lanes of Fuzhou.
The origins of local religion can be dated back centuries.
These diverse religions incorporated elements such as gods and doctrines from other religions and cultures, such as totem worship and traditional legends.
For example, Monkey King, originated to monkey worship among local ancients, gradually came to embody the God of Wealth in Fuzhou after the novel "Journey to the West" was issued in Ming dynasty.
As the most popular religion in the Min River Valley, the worship of Lady Linshui () is viewed as one of the three most influential local religions in Fujian, the other two being the worship of Mazu and Baosheng Dadi (). 
Greco-Roman religion may refer to:  Hellenistic religion  Mystery religions, initiatory cults of the Greco-Roman world  "Interpretatio graeca", the translation or interpretation of Greek and Roman deities in comparison to other myths and religions  Religion in ancient Rome, which encompasses various religions, including Greek, practiced by peoples under Roman rule  Classical mythology  
Buddhism has been the dominant religion in Cambodia, in one form or another, since the reign of Jayavarman VII (c. 1181-1200).
Before its adoption as the state religion however, Hinduism flourished for over a thousand years.
Roman Catholicism was introduced by French missionaries beginning in the eighteenth century.
Sunni Islam is practiced among the Chams, while among the Sino-Khmer population Mahayana Buddhism, Confucianism and Chinese folk religions remain popular.  
Early Christianity developed in an era of the Roman Empire during which many religions were practiced.
These included the Greco-Roman religions of the Roman Empire period, the Roman imperial cult and various mystery religions as well as philosophic monotheistic religions such as Neoplatonism and Gnosticism and to a lesser extent the "barbarian" tribal religions practiced on the fringes of the Empire.
Even before the Council of Jerusalem the Christian apostles accepted both Jewish and pagan converts (Cornelius the Centurion is traditionally considered the first gentile convert) and there was a precarious balance between the Judaizers, insisting on the obedience to the Torah Laws by all Christians, and Pauline Christianity.
With the spread of Christianity in the Early Middle Ages, it has been argued that Christianity was influenced by the rituals of Germanic paganism, Celtic paganism, Slavic paganism and Folk religion in a number of ways. 
Canaanite religion is the name for the group of Ancient Semitic religions practiced by the Canaanites living in the ancient Levant from at least the early Bronze Age through the first centuries of the Common Era.
Canaanite religion was polytheistic, and in some cases monolatristic.