Christianity started in Europe. The development that was most limited to the spread of Christianity is the development and spread of Islam throughout the Middle East and North Africa.
Islam was known to spread from the Middle East as it was widely adopted across North Africa in the second half of the 7th century CE. Its spread was mostly through trade routes.
Islamic Religion is known to make great gains to Medieval Europe as they were involved in art, architecture, medicine, agriculture. The more the Islamic religion increase, the more the Christen religion became Limited.
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