The best-reviewed free Kindle books on Amazon are "The Walk of the Spirit - The Walk of Power: The Vital Role of Praying in Tongues" by Dave Roberson and "Forget Me Not" by Dieter F. Uchtdorf, as of March 2015.
The top-rated free Kindle book on Amazon, "The Walk of the Spirit - The Walk of Power: The Vital Role of Praying in Tongues," has 376 reviews. Of those reviews, 347 feature a five-star rating. Eighteen reviews have a four-star rating, and 11 have between one and three stars.
"Forget Me Not," the second most popular free Kindle book, has 588 customer reviews. The vast majority of reviewers, 532, gave the book five stars. Forty people offered four-star ratings.
All of the top 10 free Kindle books on Amazon are related to religion or spirituality. The Church of Jesus Christ of Latter-day Saints or top-ranking members of the church distribute several of these books, including "Forget Me Not." Others focus on general spirituality or prayer. The book in third place is "Preach My Gospel: A Guide to Missionary Service."
Amazon's supply of free Kindle books changes frequently. Some authors offer free downloads limited time periods. Many of the religion-related titles are always free.