gospel

noun

1. the teachings of Jesus and the Apostles; specif., the Christian doctrine of the redemption of man through Jesus as Christ
2. the history of the life and teachings of Jesus
1. any of the first four books of the New Testament
2. an excerpt from any of these books read in a religious service
anything proclaimed or accepted as the absolute truth
also gospel truth
any doctrine or rule widely or ardently maintained
an evangelistic Protestant religious music, esp. a kind that evolved from spirituals and the black churches in the U.S.; also, a melismatic singing style characteristic of black gospel, often employing antiphonal patterns

adjective

of or having to do with (the) gospel or evangelism

See gospel in American Heritage Dictionary 4