Up to A.D.600 the diffusion of Christianity could be said to be

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The diffusion of Christianity up to A.D. 600 was mainly near the Mediterranean Sea and Mediterranean Europe. It spread from its origins in Palestine to the Roman Empire through the efforts of missionaries such as Paul and Peter, and by the 4th century it became the official religion of the Roman Empire. This led to its spread throughout most of Europe and North Africa, with the exception of the Baltic region and Scandinavia which were still largely pagan at this time. The diffusion of Christianity to the eastern Russian realm and North America would come later in history.

Up to AD600 the Diffusion of Christianity Could Be Said to Be