Popery is often tied to historical conflicts between Catholicism and Protestantism. The museum exhibit explained how accusations of popery fueled religious wars.
Pro Tip 2/3
Negative Connotations
Popery may carry a negative tone when used by those who oppose the Catholic Church's rituals. He disdainfully referred to the ornate ceremony as mere popery.
Pro Tip 3/3
Cultural Sensitivity
Using 'popery' might be seen as disrespectful by Catholics; be aware of the audience. When she mentioned popery, the Catholic listeners seemed visibly upset.