There are theological differences at the heart of the Protestant Reformation, but they are dwarfed by the socio-political concerns. Had there not been monarchs in Europe that were already trying to break from the political power of Rome, Luther would have simply been excommunicated and no one would know his name.
mzgator and Kevbo, however, misrepresent the Roman Catholic position. Roman Catholics do not follow the Pope, but rather a written and oral tradition that dates back 2,000 years. The Pope does not have the ability to change the course of the church anymore than any other individual, as his primacy is only valid when it reinforces tradition or clarifies existing belief. For example, a Pope could clarify the church’s position on a new form of birth control, but he could not invent an entirely new doctrine of salvation through peanut butter because it has no historical basis.
Roman Catholics also do not believe that their relationship with God is mediated through the clergy. The clergy act as guides to help understand and interpret the written and oral tradition that has been passed down. The Bible is a highly figurative piece of literature, and the Roman Catholic Church acknowledges that. In doing so, the clergy act as guides to help the lay people understand this highly figurative work, through textual analysis as well as imparting the understanding that has built up over the centuries.
For Roman Catholics, the relationship with God is incredibly personal. After all, Catholicism is one of the few Christian sects that believe in transubstantiation, and I’m not sure how much more personal you can get. The clergy are a support group, but do are not the sole path to salvation.
The theological base for the Reformation was the doctrine of sola scriptura adopted by Luther and the reformers, a doctrine that placed scripture as the sole basis for theology. As I’ve written, Roman (and Eastern) Catholicism relies upon a multi-pronged approach towards theology that includes historical and traditional concerns. Once scripture becomes the sole basis for theology, many doctrines become suspect – indulgences, the continued virginity of Mary, a sacramental priesthood, good works as part of faith, and the mediation of the saints are key issues that Luther brought up.
Historically, however, the Reformation marks a significant break in the history of the Big 3 religions. At that point, Judaism, Christianity and Islam all relied heavily on an oral tradition and historical approach that could not be supported by scripture alone. To this day, Islam and Judaism, as well as a majority of Christian sects and many other religions worldwide, continue to use a historical approach to theology. In this, the Reformation marks not only a separation from the Roman church, but also a separation from the a religious mode that dominates the world to this day.
I always thought that the main flaw in sola scriptura is that it was men and churches that both wrote the scripture as well as canonized it. While you can argue that the scripture was guided by the Holy Spirit, you cannot argue that the structures of man had no role in it.
(Before it is brought up, no, I’m not Catholic. I spent 3 years as a double-major in philosophy/religious studies and history).