Not surprisingly, the pope justified this pronouncement by requiring Spain and Portugal to spread Catholicism among the native inhabitants of the Americas. The missionary element of colonization, already familiar because of the long holy war against Islam within Spain itself, was powerfully reinforced in the sixteenth century, when the Protestant Reformation divided the Catholic Church. In 1517, Martin Luther, a German priest, posted his Ninety-Five Theses, which accused the Church of worldliness and corruption. Luther wanted to cleanse the Church of abuses such as the sale of indulgences (official dispensations forgiving sins). He insisted that all believers should read the Bible for themselves, rather than relying on priests to interpret it for them. His call for reform led to the rise of new Protestant churches independent of Rome and plunged Europe into more than a century of religious and political strife.
Spain, the most powerful bastion of orthodox Catholicism, redoubled its efforts to convert the Indians to the “true faith.” National glory and religious mission went hand in hand. Convinced of the superiority of Catholicism to all other religions, Spain insisted that the primary goal of colonization was to save the Indians from heathenism and prevent them from falling under the sway of Protestantism. The aim was neither to exterminate nor to remove the Indians, but to transform them into obedient, Christian subjects of the crown. Indeed, lacking the later concept of “race” as an unchanging, inborn set of qualities and abilities, many Spanish writers insisted that Indians could in time be “brought up” to the level of European civilization. Of course, this meant not only the destruction of existing Indian political structures but also a transformation of their economic and spiritual lives.