In Christendom today, there are often considered to be three primary branches - Catholicism, Eastern Orthodox, and Protestantism (debating aside whether or not this is an accurate representation of current-day Christianity). Let's first get started with the usual... Dictionary.com Protestantism noun the religion of Protestants. the Protestant churches collectively. adherence to Protestant principles. Protestant noun 1. any Western Christian who is not an adherent … Continue reading Protestantism