Which revolutionary product innovation is credited with making the Bible the first mass-produced book and dramatically increasing religious literacy in 15th century Europe?

Throughout history, the publishing and distribution of religious texts has played a crucial role in the spread of various faiths. From hand-copied manuscripts to mass-produced books, technology has transformed how religious wisdom reaches believers. This poll explores a pivotal moment in religious text distribution that revolutionized access to sacred writings and significantly impacted religious practice worldwide.

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Gutenberg's movable type printing press
The development of parchment paper by monastic scribes
The Vatican's centralized Bible production workshop
Luther's German translation distribution network