The truth is that on crucial points of Five-Point Calvinism (like Limited Atonement) up to the time of Calvin there were no strong Calvinists among the great leaders of the church, with the exception of the late Augustine
The Particular Baptists, as Calvinists historically seem to do, slipped the other direction into so called “hyper-Calvinism.” What that means, essentially, is an overemphasis on the sovereignty of God to the point of the loss of human freedom, and an eventual loss of any missionary motivation.
I don’t think I would have enjoyed being around John Calvin. I think I’d probably feel that, behind his polite smile and bulging eyeballs, he was sniffing the scent of free-thinking upon me. In a democratic society that would be fine, of course, but in a Calvinocracy like Geneva, that would mean trouble for me.
For Calvin, if a practice wasn’t prescribed in the Bible you didn’t do it. On the question of the relation of faith to reason, Luther came down heavily on the side of faith. Calvin came down on the side of reason. Since this partition between the dominance of faith or reason has been one of the great dividing lines of the history of the Church, it’s no surprise that it made a difference between them.
There are those today who take the view that the founders of the Baptist denomination (the ones who were right, anyway,) were Calvinists – and therefore all Baptists ought to be as well. This might be called the historical argument for Calvinism.