Gospel should be capitalized when used as a specific reference
to any or all of the four Gospels, for example, the four Gospels,
the Holy Gospel, the Gospel of Matthew, and in titles of
documents.
Gospel should be capitalized when beginning a sentence.
Gospel should be lowercase when used as a general term meaning
"good news" or "story", for example, "the gospel as presented in
the New Testament," "Paul took the gospel to the Romans"; of Jesus
Christ, when referring to the law and the gospels; when referring
to the law and the gospels; when referring to the third reading in
the service.