Final answer:
The subject of this question is History. It focuses on the internal divisions in Christianity and its struggle against Islam, as well as the impact of Islam on Christianity. Throughout the Middle Ages, conflicts between Christian and Muslim kingdoms were driven by various factors, including power, wealth, and politics.
Step-by-step explanation:
The subject of this question is History. The question pertains to the internal divisions in Christianity and its struggle against Islam, as well as the rise of Islam and its impact on Christianity.
Throughout the Middle Ages, there were conflicts between Christian and Muslim kingdoms, often driven by power, wealth, and politics rather than solely religious belief. The Arab conquests led to the rise of Islam and the division of Christianity. Additionally, the fragmentation of the Islamic world allowed for the establishment of Christian colonies in the Islamic world during the Crusades.
These historical events and conflicts highlight the complex relationship between Christianity and Islam during this time period.