Have you ever heard of the Protestant Reformation, sometimes just called the Reformation? If not, then you need to know a little something about this important historical event that has shaped the western world so much.
In the 16th Century (the 1500s), various people (reformers) began to protest against the Roman Catholic Church because of the way they did things. Martin Luther (not Martin Luther King) wrote 95 things he saw that were wrong or unjust about the Roman Catholic Church.
This protest (where the name "Protest-ant" comes from) sparked a huge split in the church with the Protestants bringing the focus back to God and His glory.
All of the Protestant denominations have come out of the Protestant side of things as each splinter group tries to reform further. Some have had success and some have gone too far, becoming non-Christian cult groups who you can often identify by their particular attire or presumptuous and premature titles. Find out more about some of these groups here and here.