Why did John Calvin write the Institutes of the Christian Religion?

to refute the teachings of Martin Luther

to defend a king's right to an annulment

to support the practices of the Catholic Church

to explain the Reformation and Protestant beliefs

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The institutes of the Christian religion were written by John Calvin, in order that all knew the reason for the reform and the Protestant doctrine for the time of Martin Luther, when it was raised against the traditional Christianity and Catholic, these were the right causes Which led John Calvin to write and reinforce his religious belief and to carry the message to all.