Which personalization algorithm approach is MOST commonly used by major religious retailers to recommend spiritual texts while respecting theological boundaries?

In today's digital age, even religious bookstores, spiritual item retailers, and faith-based marketplaces are adopting sophisticated personalization algorithms. These technologies help connect worshippers with resources aligned to their spiritual journeys, recommend relevant religious texts, and create customized faith experiences. How much do you know about how religious retailers are using AI and personalization to serve their communities while maintaining respect for sacred traditions?

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Collaborative filtering based on spiritual community preferences
Pure randomization to prevent algorithmic bias in sacred material
Denominational segregation that prevents cross-faith recommendations
Clergy-approved manual curation with no algorithmic input