Which revolutionary product innovation first made religious texts widely accessible to average people in 15th century Europe?

Throughout history, religious texts have been some of the most widely distributed and carefully preserved products ever created. The methods used to reproduce, distribute, and market these texts reveal fascinating insights about technological innovation, cultural values, and the evolution of publishing. This trivia question focuses on a pivotal moment in religious text distribution that changed accessibility forever.

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Gutenberg's movable type printing press, which first mass-produced the Bible
Franklin's chain of subscription libraries that offered religious texts for borrowing
Da Vinci's mechanical page-turning device for monastery reading rooms
The Vatican's mail-order catalog system for distributing approved religious materials