How did gutenberg's printing press lead to the spread of protestant ideas?

The printing press was important to the spread of the Renaissance and Humanist thinking because it made it easier to print books and pamphlets. People then soon read more often and understood the ideas written in the book or pamphlet. At the time it was the priests who only knew how to read, so they would plant ideas into people's heads causing them to not have ideas of their ideas. Because of the printing press, people started to learn to think on their own.