Do you think that the Sparrows’ rise in the Feastdance is the Westerosi Reformation, or is Martin doing something else with them?

GRRM has referenced the Reformation, but there are other examples of class-infused religious movements: John Ball during the Great Peasant Revolt of 1381, the Lollards and the Oldcastle Revolt, the Hussite Wars of the 15th century, the Cathars of the Albigensian Crusade, and the German Peasants’ War (which was actually condemned by Martin Luther, and then supported by the Anabaptists), etc.