Here in the colonies we called it Pope’s Day. There were Teo separate gangs in Boston. Each had a parade with
an effigy of the Pope. When the two parades met, they would fight each other. The winner was the one who captured the opposing Pope.
The Gunpowder Plot was an attempt by a group of Catholic English men to blow up Parliement. It WAS about religion.
The anti-Catholic Part is understandable under the circumstances.
Understandable in the context of the times these events occurred and in the times closely following, certainly. But not today. Both anti-Catholicism and anti-Protestantism have no place among Christians today.