The document summarizes the key events and impacts of the Protestant Reformation that began in 1517 when Martin Luther posted his 95 Theses criticizing the Catholic Church. This led to the establishment of Protestant churches not under the authority of the Pope and divisions in Christianity across Europe between Catholics and Protestants. The printing press, invented by Johannes Gutenberg in the 1440s, allowed for widespread distribution of the Bible and spread of new religious ideas supporting both the Protestant Reformation and divisions in European Christianity over centuries.