I'm a fan of both Elvis and gospel music, and I even have many Elvis gospel songs on my iPod.
What really stood out to me was what a tower of faith Elvis really was. Although he traveled the world and became a larger than life figure, he really was true to his roots, especially the religious roots instilled in him by his beloved mother, Gladys. Whether he was warming up before a show, in the recording studio, on the set, Elvis sang gospel music. He also integrated it into most of his shows, and his only 3 Grammy's were won for Gospel Recordings.
Great stories of how Moscheo would go up to Elvis's suite after a show to partake in all night gospel singings. I found this debunked a lot of the myths that Elvis was always womanizing after the show. Instead, he was inviting up different groups to sing with him. One night he invited Mama Cass Elliot of the Mamas and Papas, and she had a wonderful experience singing Amazing Grace.
A quick, but good read for any fan of Elvis and gospel music!