No, that’s misleading. Calvinism, Zwinglianism, and Anglicanism were not distinct confessions; they did not anathematize each other or construct confessions designed to exclude each other. Calvinism and Zwinglianism were distinct theological positions within a broad coalition of Reformed churches, of which early “Anglicanism” was simply the English expression. By the end of the century Calvinism and Zwinglianism had clearly merged, while Anglicanism was developing a separate identity through its rejection of the radical “Calvinism” fo the Puritans. But there was never a time when Calvinism, Zwinglianism, and Anglicanism existed as separate entities over against each other.
One of the things Catholics often fail to understand about early Protestantism is that it was regional and (except for the “radicals”) largely dependent on government action (Catholics are of course quick to cite this latter point to discredit Protestantism, but they don’t think through the implications of this as opposed to modern “denominationalism”). Most Protestant churches were simply the state church in a particular area, which had undertaken certain reforms based on one or another school of Protestant theology. It took a while for these various regional churches to sort themselves out into distinct confessions, by which time you had two main groups–Lutherans and Reformed–with Anglicanism more and more distinguishing itself from both as a “via media” (originally a via media between the Lutherans and Reformed, later on, at least according to some, a via media between Protestantism as a whole and Catholicism).
The Mennonites were the major organized expression of the Anabaptist movement by the later part of the century, but there were always multiple radical groups running around. It’s interesting that you exaggerate the disunity of the state-church Protestants and vastly underestimate the disunity of the radicals. The proliferation of sects has always been a function of the radical wing of Protestantism–it’s just that this “free church” wing has become bigger and more important with each century, so that now it’s no longer a radical wing but the dominant expression of Protestantism. And, of course, with the lack of a state church in the U.S. even the formerly state-church traditions have tended to imitate the free churches, including their tendency to splinter.
Enjoy.
If miracles are genuine, they are the work of God always; sometimes, He works them through created beings.