Identified by Protestants with their own system of belief, as opposed to the perversions of Christianity imputed by them to their adversaries…

= Protestantism, n. 1; spec. (in the 17th cent.) the system of the reformed Church of England, as distinguished from Catholicism, Presbyterianism…

With the and capital initial. Chiefly in French contexts: Protestantism. Obsolete (historical in later use).

The religion of Protestants, as opposed to Roman Catholicism; the condition of being Protestant; adherence to Protestant principles.

Protestantism. Obsolete. rare.