Protestantism is the set of Christian beliefs that are held by Protestants.
...the spread of Protestantism.
Protestantism in British English
(ˈprɒtɪstənˌtɪzəm)
noun
1.
the religion or religious system of any of the Churches of Western Christendom that are separated from the Roman Catholic Church and adhere substantially to principles established by Luther, Calvin, etc, in the Reformation
2.
the Protestant Churches collectively
3.
adherence to the principles of the Reformation
Examples of 'Protestantism' in a sentence
Protestantism
There was the religious question of course, but he didn't expect her Protestantism was immovable.