In the book: Move: What 1,000 Churches Reveal about Spiritual Growth, the author’s rollup and summarize data from a survey of over a 1,000 churches.
Here’s a quote from page 167: “If they [Church Pastors] could do only one thing to help people at all levels of spiritual maturity grow in their relationship with Christ, their choice would be equally clear. They would inspire, encourage, and equip their people to read the Bible – specifically, to reflect on Scripture for meaning in their lives.”