Galatians 1:6 KJV
I marvel that ye are so soon removed from him that called you into the grace of Christ unto another gospel:
Scofield's note are good.
"The test of the Gospel is grace. If the message excludes grace, or mingles law with grace as the means of either of justification or sanctification, (Gal_2:21); (Gal_3:1-3), or denies the fact or guilt of sin which alone gives grace its occasion and opportunity, it is "another" gospel, and the preacher of it is under the anathema of God."
Paul calls the gospel here, "the grace of Christ." Grace is the gospel. A gospel that is anything other is another gospel and accursed of God.