WordNet sense 1 (folk music consisting of a genre of a cappella music originating with Black slaves in the United States and featuring call and response; influential on the development of other genres of popular music (especially soul)):

gospel singing

WordNet sense 2 (the written body of teachings of a religious group that are generally accepted by that group):

creed, religious doctrine, church doctrine

WordNet sense 3 (an unquestionable truth):

gospel truth

WordNet sense 4 (the four books in the New Testament (Matthew, Mark, Luke, and John) that tell the story of Christ's life and teachings):

evangel, Gospels