Which AI-powered personalization approach has most significantly increased customer retention rates for online religious bookstores in the past three years?

Religious bookstores and spiritual merchandise retailers are evolving with technology to better serve their communities. The personalization of religious product recommendations has become increasingly sophisticated in recent years, helping devotees find texts, items, and resources aligned with their specific spiritual journey. How well do you understand the intersection of religious retail and modern personalization algorithms?

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Denominational filtering (suggesting products based on specific faith traditions)
Spiritual journey mapping (recommending resources based on where someone is in their faith development)
Theological compatibility scoring (matching products to a customer's doctrinal positions)
Community endorsement aggregation (suggesting items popular among similar congregation members)