One reason the population of the Palatinate was virtually exterminated—by the French— was because they were Calvinists.
The Calvinists were the great losers of the wars of the 18th century.
They all decamped to America.
The German & Dutch reformed churches were Calvinist. As were the English puritans and Scottish Presbyterians. And too the smaller groups of French Huguenots and Swedish Reformed Churches.
Calvinism was the majority theology at the time of the revolution. And the writers of the Constitution in Madison’s group were all Calvinists.
After the Revolution— Calvinism went into decline.
Today, the Rheinpfalz, or Palatine is solidly Lutheran—at least it was back in the 1980’s when I last visited. I was told that there are also some Mennonites in the area.
A small Jewish cemetery can be found outside of Kindenheim, where a friend of mine lives. The gravestones date back to the eighteenth century, and the newest grave is dated 1937.