The Gospel of Christ is the gospel of Grace, there is no other gospel. The gospel is the new covenant that God promised through His prophets, On Jerimiah 31:31, quoted again in the book of Hebrews says.
Hebrews 8:8 King James Version (KJV)
8 For finding fault with them, he saith, Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah:
Do not be confused and say this scripture speaks only about the house of Israel. Remember in the new covenant, the bible tells us that there is no Jew or Gentile, there is no male or female, we are one in Christ, the body of Christ.
Let me give you background information about the old covenant. In the old covenant you have to keep the law to be justified or to be righteous and accepted by God. We all know no one kept the law except our Lord Jesus Christ, for this reason they had to offer sin offerings and burn offerings. In the new testament, the bible tells that those offerings covered their sins for one year and they have to do it each year. Now I am talking about the children of Israel whom the law was given.
The problem with those offering, they only covered their sins for particular period and could not make anyone holy. Hebrews 10:4 says, “4 It is impossible for the blood of bulls and goats to take away sins.”
Hebrews 10:8-10 New International Version (NIV)
8 First he said, “Sacrifices and offerings, burnt offerings and sin offerings you did not desire, nor were you pleased with them”—though they were offered in accordance with the law. 9 Then he said, “Here I am, I have come to do your will.” He sets aside the first to establish the second. 10 And by that will, we have been made holy through the sacrifice of the body of Jesus Christ once for all.
Now we know though those sacrifice were offered but they only cover their sins for that particular period. They did not take away their sins and they could not make anyone holy.
On verse nine, Christ made it clear that, He came to set aside the old covenant and establish the new covenant which is the gospel. Glory to God, in the new covenant that was established by our Lord Jesus Christ through the sacrifice of His body at the cross, we have been made holy.
John the Baptist when he saw Jesus Christ said, “Behold there is the lamp of God who takes away the sin of the world”
Apostle Paul made it clear in the book of Galatian that there is no other gospel, if any preaches the gospel other than the gospel of grace which is the grace of God, let him be accursed. You do not believe me let me show you the scripture.
Galatians 1:6-8 King James Version (KJV)
6 I marvel that ye are so soon removed from him that called you into the grace of Christ unto another gospel: 7 Which is not another; but there be some that trouble you, and would pervert the gospel of Christ.8 But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.
Do I need to say more? There is only one gospel and that is the grace of Christ and there is no other gospel.
I like the way Apostle Paul has used these phrases, interchangeable, meaning they mean the same thing. On verse 6, he first used ‘the grace of God’ and the gospel. On verse 7 he used the gospel of Christ and all this terms refer to one thing, the gospel which is the new covenant.
The Holy Spirit knew exactly that they would be smart people who would pervert the grace of Christ into a different Gospel. Paul said those who pervert the Grace of Christ into another Gospel let them be accursed. No matter who they are, even if it is an angel from heaven, le him be accused.
If you are not preaching the gospel of grace, I wonder what you are preaching. If you are not being preached the Gospel of grace, you are being robbed, of its beauty, its greatness. The gospel of Christ is awesome!! It is not from men but it is from God. It is revealed.
You cannot preach the law and say you are preaching the Gospel. Those are two different things, the former is the old and the latter is the new.
You can never mix them as many suggest and this thing of mixture is not scriptural. This is the most dangerous and destructive thing in the body. In essence, you are saying that Christ sacrifice is not enough, you want to add something. You tell me now, what can you add on what Christ has done.
The Lord Jesus Christ said, ‘You cannot pour a new wine into the old wineskin and visa versa, lest it would ruin everything.
In conclusion, you cannot mix the two covenants as it suites you. There is only one Gospel the grace of Christ. And Paul said, he is not ashamed of this gospel for it is the power of God unto salvation.
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