Accounting for the role of John Calvin in the modern Christianity

Dr Alexander S Waugh rightly corrects my typing error placing John Calvin (1509-1564) in the seventeenth rather than the sixteenth century. He was, in fact, a "sixteenth-century French divine". However, on the issue of Calvin being "much less of a predestinarian" than Luther or Zwingli we can only form our opinions from the history we read. My historical reading sources are unequivocal. They say the spirit of Zwinglianism reached its fullest development in the theology, political theories, and ecclesiastic thought of John Calvin.