What is the theme in Martin & Malcolm & America: A Dream or a Nightmare by James H. Cone?

One important theme in the book is the contrast Cone draws between King's Christian theology and Malcolm X's Islamic theology. King was raised in a loving Christian household; his father was a minister who fought for racial justice and racial equality. He said that he came to believe in a loving God because he grew up in a loving home. King had doubts about the truth of Christianity, particularly as he became disillusioned with the "fundamentalism" that was practiced in his home church of Ebenezer Baptist. When he went to college, he was introduced to liberal theology, which emphasized the goodness of humanity and the impossibility of the persistence of injustice due to God's guiding hand in history.