Which product innovation in religious text publishing first allowed mass ownership of personal Bibles in the 1450s, dramatically transforming Christian practice?

Throughout history, religious texts have undergone significant transformations in how they're produced, packaged, and distributed to believers. From hand-copied scrolls to mass-produced books, the product development and marketing of sacred texts represents one of humanity's oldest continuous product lines. This poll explores a fascinating moment in the evolution of religious text production that revolutionized accessibility and transformed spiritual practice for millions of believers worldwide.

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Gutenberg's movable-type printing press
The development of paper made from cotton rags
The standardization of Latin Vulgate translation
The introduction of leather-bound codex format