While reading in the book of Acts, I started looking up the definition of evangelism which led me to evangelical and evangelist ~ here are the Websters 1828 definitions
Evangelism "the promulgation (spreading/sharing) of the gospel
Evangelical "according to the gospel, contained in the gospel, sound in the doctrines in the gospel"
Evangelist "A preacher or publisher of the gospel of Jesus Christ, licensed to preach, but not having charge of a particular church"
So all of these point to "Gospel"...so what is that meaning ~
Gospel "The history of the birth, life, actions, death, resurrection, ascension and doctrines of Jesus Christ; or a revelation of the grace of God to fallen man through a mediator, including the character, actions, and doctrines of Christ, with the whole scheme of salvation, as revealed by Christ and His apostles."
So in just thinking outloud here....its amazing that Webster recognized these truths in 1828 but they escape many today.
Romans 1: 16 & 17 "16 For I am not ashamed of the gospel of Christ, for it is the power of God to salvation for everyone who believes, for the Jew first and also for the Greek. 17. For in it the righteousness of God is revealed from faith to faith; as it is written, The just shall live by faith."
Ephesians 1:13 "In Him you also trusted, after you heard the word of truth, the gospel of your salvation; in whom also, having believed, you were sealed with the Holy Spirit of promise"
Its not the Gospel of the Bible without Christ.