It refers to a wide variety of Christian churches - many of the non-catholic churches are included in this category. From the Wikipedia article: "The term is most closely tied to those groups that separated from the Roman Catholic Church in the sixteenth-century Protestant Reformation."
Protestantism.
Protestantism
Christianity; protestantism.
Protestantism in Ireland.
Christian.
England major practiced religion is Protestantism.
The Church of Finland (Lutheran protestantism) is the official religion.
Sir Francis Walsingham's religion was Protestantism.
Christianity.
Protestantism
Protestantism.
I would say protestantism since that was the state religion of Sweden.