We have strayed from the O.P.
I would never list Calvin as a theologian whom I agree with fully. I am not a Presbyterian, nor am I a paedobaptist and I would not have burned Servetus,
However, as a theologian he 'bestrides the world as a colossus.' The famous scientist Isaac Newton was once asked how he had seen further than others of his profession, "If I have seen further," he replied, "It is because I have stood on the shoulders of giants." All serious Protestant theologians, including the 17th Century Particular Baptists, have stood on Calvin's shoulders, and if they have developed his teachings it is because they first learned of him.
However, Calvin did not originate Calvinism. Luther, Tyndale, Zwingli, Bucer were all Calvinists while he was still in short pants.