Answer :
Final answer:
The Protestant Reformation and Scholasticism were the main causes of the proliferation of Christian sects.
Explanation:
The primary causes of the number and variety of Christian sects are the Protestant Reformation in the 1500s CE and the Scholasticism in the 1200s CE. The Protestant Reformation, spearheaded by Martin Luther, led to a break with the Roman Catholic Church and gave rise to various Protestant denominations. Scholasticism, which aimed to reconcile classical philosophy with Christian teachings, also contributed to the development of differing theological interpretations within Christianity.
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