The Gospel is the good news which is the power of God that brings forth salvation to everyone who believes.
Romans 1:16-17
For I am not ashamed of the gospel, because it is the power of God that brings salvation to everyone who believes: first to the Jew, then to the Gentile. 17 For in the gospel the righteousness of God is revealed—a righteousness that is by faith from first to last, just as it is written: “The righteous will live by faith.”
Jesus taught more on the Kingdom of God( the gospel ) than any other topic or doctrine.
Jesus mentions the Kingdom over 100 times in the gospels. It is the most important thing Jesus taught during His earthly ministry. Here are just a few passages on the kingdom from the 4 gospels. The kingdom is like a multi-faceted diamond and the gospel is the core-center of that diamond. There are many facets to the kingdom but there is only one gospel that saves. Your response tells me you have not given the subject any serious thought.
Mark 1:14-15
Jesus came into Galilee, preaching the gospel of God, 15 and saying, “The time is fulfilled, and the kingdom of God is at hand; repent and believe in the gospel.”
Matthew 24:14
And this gospel of the kingdom will be proclaimed throughout the whole world as a testimony to all nations, and then the end will come.
Luke 17:21
Nor will they say, ‘Look, here it is!’ or ‘There!’ for behold, the kingdom of God is in the midst of you.”
John 18:36
Jesus answered, "My kingdom is not of this world; if it were, My servants would fight to prevent My arrest by the Jews. But now, My kingdom is not of this realm."
Romans 14:17 Paul declared that the kingdom of God is a matter “of righteousness and peace and joy in the Holy Spirit.”
1-The kingdom of God is a spiritual kingdom !
2-Jesus declared that His kingdom was not of this world in John 18:36,
3-Jesus preached that repentance is necessary to be a part of the kingdom of God in Matthew 4:17
4-Jesus said to Nicodemus that the kingdom of God can be equated with salvation in John 3:5–7, where Jesus says the kingdom of God must be entered into by being born again in John 3:3- Jesus replied, “Very truly I tell you, no one can see the kingdom of God unless they are born again.
There is One God
There is One Lord
There is One Faith
There is One Baptism
There is One Jesus
There is only One way to God
There is One Savior
And there is One Gospel
Galatians 1:6
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.
9 As we said before, so say I now again, if any man preach any other gospel unto you than that ye have received, let him be accursed.
So since there is only One God, One Savior, One way to God through Christ, One faith, One baptism and One Gospel- there is only one way to be saved.
Christ Crucified Is God’s Power and Wisdom- the gospel
1 Corinthians 1:10-31
I appeal to you, brothers and sisters, in the name of our Lord Jesus Christ, that all of you agree with one another in what you say and that there be no divisions among you, but that you be perfectly united in mind and thought. 11 My brothers and sisters, some from Chloe’s household have informed me that there are quarrels among you. 12 What I mean is this: One of you says, “I follow Paul”; another, “I follow Apollos”; another, “I follow Cephas”; still another, “I follow Christ.”
13 Is Christ divided? Was Paul crucified for you? Were you baptized in the name of Paul? 14 I thank God that I did not baptize any of you except Crispus and Gaius, 15 so no one can say that you were baptized in my name. 16 (Yes, I also baptized the household of Stephanas; beyond that, I don’t remember if I baptized anyone else.) 17 For Christ did not send me to baptize, but to preach the gospel—not with wisdom and eloquence, lest the cross of Christ be emptied of its power.
18 For the message of the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God. 19 For it is written:
“I will destroy the wisdom of the wise;
the intelligence of the intelligent I will frustrate.”
20 Where is the wise person? Where is the teacher of the law? Where is the philosopher of this age? Has not God made foolish the wisdom of the world? 21 For since in the wisdom of God the world through its wisdom did not know him, God was pleased through the foolishness of what was preached to save those who believe. 22 Jews demand signs and Greeks look for wisdom, 23 but we preach Christ crucified: a stumbling block to Jews and foolishness to Gentiles, 24 but to those whom God has called, both Jews and Greeks, Christ the power of God and the wisdom of God. 25 For the foolishness of God is wiser than human wisdom, and the weakness of God is stronger than human strength.
26 Brothers and sisters, think of what you were when you were called. Not many of you were wise by human standards; not many were influential; not many were of noble birth. 27 But God chose the foolish things of the world to shame the wise; God chose the weak things of the world to shame the strong. 28 God chose the lowly things of this world and the despised things—and the things that are not—to nullify the things that are, 29 so that no one may boast before him. 30 It is because of him that you are in Christ Jesus, who has become for us wisdom from God—that is, our righteousness, holiness and redemption. 31 Therefore, as it is written: “Let the one who boasts boast in the Lord.”
What is the Gospel you ask ?
Paul defines that Gospel by which we are saved below:
1 Corinthians 15:1-19
Now I make known to you, brethren, the gospel which I preached to you, which also you received, in which also you stand, 2 by which also you are saved, if you hold fast the word which I preached to you, unless you believed in vain.
3 For I delivered to you as of first importance what I also received, that Christ died for our sins according to the Scriptures, 4 and that He was buried, and that He was raised on the third day according to the Scriptures, 5 and that He appeared to Cephas, then to the twelve. 6 After that He appeared to more than five hundred brethren at one time, most of whom remain until now, but some have fallen asleep; 7 then He appeared to James, then to all the apostles; 8 and last of all, as to one untimely born, He appeared to me also. 9 For I am the least of the apostles, and not fit to be called an apostle, because I persecuted the church of God. 10 But by the grace of God I am what I am, and His grace toward me did not prove vain; but I labored even more than all of them, yet not I, but the grace of God with me. 11 Whether then it was I or they, so we preach and so you believed.
12 Now if Christ is preached, that He has been raised from the dead, how do some among you say that there is no resurrection of the dead? 13 But if there is no resurrection of the dead, not even Christ has been raised; 14 and if Christ has not been raised, then our preaching is vain, your faith also is vain. 15 Moreover we are even found to be false witnesses of God, because we testified against God that He raised Christ, whom He did not raise, if in fact the dead are not raised. 16 For if the dead are not raised, not even Christ has been raised; 17 and if Christ has not been raised, your faith is worthless; you are still in your sins. 18 Then those also who have fallen asleep in Christ have perished. 19 If we have hoped in Christ in this life only, we are of all men most to be pitied.
Only One way to be saved, by One Person, One Gospel and One Faith. In Him alone. Scripture is really very exclusive here but inclusive to all that come to Him freely!
Revelation 14:6
Then I saw another angel flying overhead, with the eternal gospel to proclaim to those who dwell on the earth—to every nation and tribe and tongue and people
Acts 4:12
And there is salvation in no one else; for there is no other name under heaven that has been given among men by which we must be saved
1 Timothy 2:5
For there is one God and one mediator between God and men, the man Christ Jesus,
Jesus passed on the gospel to His Disciples. Its the same Gospel but Christ had not suffered, died, risen yet. The disciples didn't understand the Passion until after His Resurrection, they were in denial.
Before His Resurrection
Jesus replied, “You do not realize now what I am doing, but later you will understand…. I am telling you now before it happens, so that when it does happen you will believe that I am who I am.” — John 13:7,19
After he was raised from the dead, his disciples recalled what he had said. Then they believed the scripture and the words that Jesus had spoken. — John 2:22
From that time on Jesus began to explain to his disciples that he must go to Jerusalem and suffer many things at the hands of the elders, the chief priests and the teachers of the law, and that he must be killed and on the third day be raised to life. — Matthew 16:21
Now Jesus was going up to Jerusalem. On the way, he took the Twelve aside and said to them, “We are going up to Jerusalem, and the Son of Man will be delivered over to the chief priests and the teachers of the law. They will condemn him to death and will hand him over to the Gentiles to be mocked and flogged and crucified. On the third day he will be raised to life!” — Matthew 20:17-19
After His Resurrection
He said to them, “How foolish you are, and how slow to believe all that the prophets have spoken! Did not the Messiah have to suffer these things and then enter his glory?” And beginning with Moses and all the Prophets, he explained to them what was said in all the Scriptures concerning himself. — Luke 24:25-27
He said to them, “This is what I told you while I was still with you: Everything must be fulfilled that is written about me in the Law of Moses, the Prophets and the Psalms.” Then he opened their minds so they could understand the Scriptures. — Luke 24:44-45
hope this helps !!!