[Biblestudent]

That was what I thought before. But the word "gospel" simply means "good tidings" or "good news". The content of that gospel is important.

EVERLASTING GOSPEL
Revelation 14:6 And I saw another angel fly in the midst of heaven, having the everlasting gospel to preach unto them that dwell on the earth, and to every nation, and kindred, and tongue, and people,
7 Saying with a loud voice, Fear God, and give glory to him; for the hour of his judgment is come: and worship him that made heaven, and earth, and the sea, and the fountains of waters.
Preacher of this gospel: angel
Content of this gospel: hour of his judgment is come...

GOSPEL OF THE KINGDOM
Matthew 24:13 But he that shall endure unto the end, the same shall be saved.
14 And this gospel of the kingdom shall be preached in all the world for a witness unto all nations; and then shall the end come.
Mark 1:14 Now after that John was put in prison, Jesus came into Galilee, preaching the gospel of the kingdom of God,
15 And saying, The time is fulfilled, and the kingdom of God is at hand: repent ye, and believe the gospel.
Matthew 10:5 These twelve Jesus sent forth, and commanded them, saying, Go not into the way of the Gentiles, and into any city of the Samaritans enter ye not:
6 But go rather to the lost sheep of the house of Israel.
7 And as ye go, preach, saying, The kingdom of heaven is at hand.
8 Heal the sick, cleanse the lepers, raise the dead, cast out devils: freely ye have received, freely give.
9 Provide neither gold, nor silver, nor brass in your purses,
10 Nor scrip for your journey, neither two coats, neither shoes, nor yet staves: for the workman is worthy of his meat.
Preachers of this gospel: John the Baptist, Jesus (when on earth), theTwelve
Content of this gospel: repentance, baptism, enduring = Holy Ghost (Ac 2:38,39), signs (Mr 16), kingdom (promise fulfilled)

GOSPEL OF THE GRACE OF GOD
Romans 11:13 For I speak to you Gentiles, inasmuch as I am the apostle of the Gentiles, I magnify mine office:
Galatians 1:11 But I certify you, brethren, that the gospel which was preached of me is not after man.
12 For I neither received it of man, neither was I taught it, but by the revelation of Jesus Christ.
Ephesians 3:1 For this cause I Paul, the prisoner of Jesus Christ for you Gentiles,
2 If ye have heard of the dispensation of the grace of God which is given me to you-ward:
3 How that by revelation he made known unto me the mystery; (as I wrote afore in few words,
4 Whereby, when ye read, ye may understand my knowledge in the mystery of Christ)
5 Which in other ages was not made known unto the sons of men, as it is now revealed unto his holy apostles and prophets by the Spirit;
6 That the Gentiles should be fellowheirs, and of the same body, and partakers of his promise in Christ by the gospel:
7 Whereof I was made a minister, according to the gift of the grace of God given unto me by the effectual working of his power.
8 Unto me, who am less than the least of all saints, is this grace given, that I should preach among the Gentiles the unsearchable riches of Christ;
9 And to make all men see what is the fellowship of the mystery, which from the beginning of the world hath been hid in God, who created all things by Jesus Christ:
1 Timothy 2:7 Whereunto I am ordained a preacher, and an apostle, (I speak the truth in Christ, and lie not; ) a teacher of the Gentiles in faith and verity.
2 Timothy 1:11 Whereunto I am appointed a preacher, and an apostle, and a teacher of the Gentiles.

Ephesians 2:8 For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:
9 Not of works, lest any man should boast.
Titus 3:5 Not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost;
Romans 11:6 And if by grace, then is it no more of works: otherwise grace is no more grace. But if it be of works, then is it no more grace: otherwise work is no more work.
1 Corinthians 15:1 Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand;
2 By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain.
3 For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures;
4 And that he was buried, and that he rose again the third day according to the scriptures:

Preacher of this gospel: Paul
Content of this gospel:Faith (death, burial, and resurrection of Christ) = salvation

Paul says "I" when talking about his unique gospel received by revelation from heaven.
Peter and John says "us" and "we" when referring to the message they received during Christ's earthly ministry.
Example:
1 John 1:1 That which was from the beginning, which we have heard, which we have seen with our eyes, which we have looked upon, and our hands have handled, of the Word of life;
2 Peter 1:16 For we have not followed cunningly devised fables, when we made known unto you the power and coming of our Lord Jesus Christ, but were eyewitnesses of his majesty.
17 For he received from God the Father honour and glory, when there came such a voice to him from the excellent glory, This is my beloved Son, in whom I am well pleased.
18 And this voice which came from heaven we heard, when we were with him in the holy mount.

A personal testimony: I thought this truth would break my fundamental baptist theology, but it didn't; it "edified" and made me certain that indeed there is only ONE GOSPEL that saves today - the GOSPEL OF THE GRACE OF GOD. Any verse that seems to teach "any other gospel" is "another gospel" when preached today, although "not another"(Gal. 1:6-8) under the Law or during the Tribulation Period . This approach taught me not to add, diminish, or wrest scripture, but to simply rightly divide the word of truth. Praise the Lord!