Which marketing strategy revolutionized religious book sales in the early 2000s, leading to a 300% increase in Bible purchases among young adults?

The religious book market represents a significant segment of publishing, with unique marketing challenges and consumer behaviors. Faith-based retailers, publishers, and online platforms employ specialized strategies to connect spiritual products with their target audiences. This trivia question explores an interesting phenomenon in religious book retail that transformed marketing approaches in this niche industry.

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Lifestyle-based Bible editions (themed for teens, women, men, etc.)
Celebrity pastor endorsements on book covers
Implementation of QR codes linking to sermon content
Free digital app access with physical book purchase