do you think that Luther was right to start a reformation back then
I believe he made valid theological insights, which he believed he was bound in good conscience to pursue even if the authorities disagreed. The result was the start of the Reformation, which I doubt Luther foresaw all the consequences when he initiated it–some good, some bad.
Do you think that his theology was less about doctrine and more about protecting the people?
It was about doctrine. The dispute over scriptural authority, justification by faith alone, the Eucharist and the universal priesthood were all doctrinal. Luther was both a theologian and a pastor, so he also had pastoral concerns. The
95 Theses, Luther’s proposal for academic debate that sparked the controversy, were mainly concerned with the sale of indulgences to finance the building of St. Peter’s Basilica in Rome, the abuses this led to, the false hope and security such abuses were giving to individuals, and the theological rationale behind such practices.
His teachings on justification by faith alone was a reaction to the
via moderna school of theology whose soteriology was summed up by the phrase
facere quod in se est (“do what lies within you” or “do your best”). “Doing your best” (which meant rejecting evil and trying to do good) was the precondition necessary for justification. In response, Luther gravitated toward Augustinianism, which denied that humans could initiate their own justification. Luther’s main difference with Augustine is where each located the righteousness given to us by God. Luther said it remained outside the believer (an alien righteousness). Augustine said that the righteousness originated outside the believer but became a part of his person. This is where we get the infused versus imputed debate.
Luther was somewhat radical theologically, but he was not a social radical. He was not calling for massive social changes, but his calls for church reform and a universal priesthood did help to inspire radical movements like the Peasant Revolts in the 1520s. However, Luther repudiated this political interpretation of his theology.
How much of his doctrine corresponds with today’s catholicism?
Are you asking if his criticisms of medieval Catholicism still apply to contemporary Catholicism? Or are you asking how much agreement is there between Luther’s theology and Catholic theology today?