Protestantism refers to the practice of a form of Christianity, and these individuals differ from Catholics and those who follow the Orthodox version of Christianity in a number of different ways. Unlike Catholics those who practice Protestantism do not believe that the Pope is the head of the church. Protestantism quotes show that these followers believe the bible and the scriptures that it contains are the only source of salvation, and this form of Christianity dates back to the 16th century. Protestantism involves 5 major tenets that are called solas, and these outline the ways to salvation. These tenets include scripture alone, faith alone, grace alone, Christ alone, and for the glory of god alone. These 5 solas form the foundation of Protestantism and they are firmly believed by followers.