I did some research yesterday to see how Wesley defined the gospel. I found his explanation in the sermon "The Way of the Kingdom":
8. The gospel, (that is, good tidings, good news for guilty, helpless sinners,) in the largest sense of the word, means, the whole revelation made to men by Jesus Christ; and sometimes the whole account of what our Lord did and suffered while he tabernacled among men. The substance of all is, "Jesus Christ came into the world to save sinners;" or, "God so loved the world that he gave his only-begotten Son, to the end we might not perish, but have everlasting life;" or, "He was bruised for our transgressions, he was wounded for our iniquities; the chastisement of our peace was upon him; and with his stripes we are healed."Agreement on the substitionary atonement of Christ as being the center of gospel ministry is non-negotiable if The United Methodist Church will reclaim faithfulness to our founder's intent and the good news of Christ.