The printing press had the biggest impact on religion, primarily Christianity, than any other text in the world. One of the biggest reasons for this is that the Biblical text did not change overtime. This meant that producing the Bible was a lot less difficult than any other text that develops and changes over time.
One of the key events that relates to the printing press was the Reformation. The success of this event was mainly due to the ability of the printing press to mass produce the same message. However, as the Bible became available to more and more people, it quickly inspired religious contradictions and damaged the authority of the church, which then lead to the Reformation. The “95 Thesis” contained Martin Luther’s disagreements with the church. Along with other reformers, he was one of the first to successfully use the printing press to spread ideas to a large audience.
“No reformer was more adept than Martin Luther at using the power of the press to spread his ideas. Between 1518 and 1525, Luther publishes more works than the next 17 most prolific reformers combined.” (Source)