Institutes of the Christian Religion
The denomination is part of the worldwide family of reformed churches which came into being at the time of the Reformation, and declared themselves reformed from the teachings and practices of the Roman Catholic Church at that time. Whereas Martin Luther was the champion of the Reformation in Germany, John Calvin was the champion of the Reformation in Switzerland, the Netherlands and northern Europe. It is John Calvin's understanding of the Bible, as spelled out in his Institutes of the Christian Religion, that forms the doctrinal basis of the various reformed churches.