The word derives from the Old English word Godspell, or “good news.” It is a translation of the Greek word evangelion. This refers to the “good news” that Jesus Christ came as the Messiah, was crucified for the sins of humanity, died and then rose from the grave to triumph over death. Of the many gospels written in antiquity, four came to be accepted as part of the New Testament – Matthew, Mark, Luke and John. Capitalize when referring to each or all of the first four books of the New Testament. Lowercase in all other references.
REFERENCE: Religion Stylebook