Most historians believe the Renaissance was an ideological precursor to the Protestant Reformation. Consequently, the two movements bear many similarities. Two major similarities are the emphasis on the individual person and classical languages.
First, the Renaissance became the first major Western movement to emphasize the individual self. Most previous eras had emphasized the individual's role within an ethnic, national, or religious group. Renaissance thinkers and artists, however, celebrated the individual apart from his community. This influenced the Protestants, who asserted that salvation was found through one's personal relationship with God, rather than within the Catholic Church.
Second, both movements placed a high value on the classical languages. Latin had served as the primary language for educated people throughout the Middle Ages; however, the language had become convoluted over time. Renaissance linguists sought to return Latin to its classical Roman form. They also placed a renewed emphasis on the Greek language and culture. Likewise, the Protestant Reformers sought to read the Bible in its original languages (Hebrew and Greek) rather than in the Latin translation used by the Catholic Church--the Vulgate. This caused them to reach different theological conclusions (specifically about salvation) from the Church.