There's no such thing as Calvinism. No one sat down to codify 'Calvinism' like the disciples of Arminius did their Five Points of Remonstrance, or their objections to the Gospel breaking forth from the fangs of Romanism.
It's just that Calvin was a principal player (like Luther) in the drama that unfolded, and the most noteworthy, and the first in modern history to set down in order and expound on the main tenets of the Christian faith in his magnum opus, The Institutes of the Christian Religion, which follows the outline of the Apostles' Creed.
It seemed new to those who walked in the darkness of Rome, so it got labled with Calvin's name, but the Morning Star of the Reformation was John Wycliffe, and he was a Calvinist three hundred years prior to the advent of John Calvin, and twelve hundred years before that, was Paul.
Paul was the first in the history of the world to expound at length on the doctrine of election, or the Doctrines of Grace, as they are called now.
So there is no such thing as Calvinism. There is no Calvinist church, like there is a Lutheran church. And there is no Pauline Church. There is only the Gospel.