Which product innovation is credited with making religious texts widely accessible to the masses for the first time in Western history?

Throughout history, religious texts have been among the most influential 'products' ever created, with their dissemination fundamentally shaping civilizations. Yet many don't realize how modern product development and marketing principles have dramatically impacted religious publishing. This trivia question explores a pivotal moment in religious text distribution that revolutionized accessibility and transformed spiritual practice worldwide.

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Gutenberg's movable-type printing press (1450s)
Coptic bound manuscripts (2nd century)
Illuminated monastic scrolls (9th century)
Steam-powered cylinder press (1810s)