Early Christianity developed in the Roman Empire, where many religions were practiced that are, for lack of a better term, labeled paganism. Paganism is commonly used to refer to various, largely unconnected religions from the time period, such as the Greco-Roman religions of the Roman Empire, including the Roman imperial cult, the various mystery religions, monotheistic religions such as Neoplatonism and Gnosticism, and more localized ethnic religions practiced both inside and outside the Empire. During the Middle Ages, the term was also adapted to refer to religions practiced outside the former Roman Empire, such as Germanic paganism and Slavic paganism.
From the point of view of the early Christians these religions all qualified as ethnic (or gentile, ethnikos, gentilis, the term translating goyim, later rendered as paganus) in contrast with Second Temple Judaism.
In the course of the Christianisation of Europe in the Early Middle Ages, the Christian churches adopted many elements of national cult and folk religion, resulting in national churches like Latin, Germanic, Russian, Armenian, Greek, and so on. Some Pagan ceremonies were brought in and the festivals became modern holidays as pagans joined the early church. The Pagan vernal equinox celebration was 'Christianized' and then referred to as the Annunciation to the Blessed Virgin Mary or Annunciation of the Lord and celebrated as the Feast of the Annunciation. The Germanic Pagan solstice celebrations (Midsummer festivals) are also sometimes referred to by Neopagans and others as Litha, stemming from Bede's De temporum ratione and the fire festival or Litha was a tradition for many pagans. This pagan holiday was basically brought in and given a name change, and in Christianity was then associated with the nativity of John the Baptist, which now is observed on the same day, June 24, in the Catholic, Orthodox and some Protestant churches. It is six months before Christmas because Luke 1:26 and Luke 1.36 imply that John the Baptist was born six months earlier than Jesus, although the Bible does not say at which time of the year this happened.