No, not all of the Pennsylvania Dutch were Amish.
There were also Mennonites, Lutherans, and some other denominations who had heard about Pennsylvania’s tradition of religious freedom.
By 1790, people of German descent made up about a third of the state’s population.
Most of the original Pennsylvania Dutch are the descendants of Germanic peoples who emigrated to the U.S.
Although the Pennsylvania Dutch have various religious affiliations, the Pennsylvania Dutch language is ultimately a derivative of Palatinate German.