"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,
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' "
(Rev 14:6-7 AV).
You might also want to include the προευηγγελισατο (proeuangelisato = pregospel) unto Abram:
"He therefore that ministereth to you the Spirit, and
worketh miracles among you, doeth he it by the works of the
law, or by the hearing of faith?
Even as Abraham believed God, and it was accounted to him
for righteousness.
Know ye therefore that they which are of faith, the same
are the children of Abraham.
And the scripture, foreseeing that God would justify the
heathen through faith, preached before the gospel unto
Abraham, saying, In thee shall all nations be blessed.
So then they which be of faith are blessed with faithful Abraham.
(But)For as many as are of the works of the law are under the
curse: for it is written, Cursed is every one that continueth
not in all things which are written in the book of
the law to do them" (Gal. 3:5-10 AV; see Gen.12:2-3).
The Gospel preached unto Abram/Abraham was that salvation is by faith apart from one's own works. As Matthew Henry writes:
"The apostle proves the doctrine he had blamed the Galatians for rejecting; namely, that of justification by faith without the works of the law. This he does from the example of Abraham, whose faith fastened upon the word and promise of God, and upon his believing he was owned and accepted of God as a righteous man. The Scripture is said to foresee, because the Holy Spirit that indited the Scripture did foresee. Through faith in the promise of God he was blessed; and it is only in the same way that others obtain this privilege.
Let us then study the object, nature, and effects of Abraham's faith; for who can in any other way escape the curse of the holy law? The curse is against all sinners, therefore against all men; for all have sinned, and are become guilty before God: and if, as transgressors of the law, we are under its curse, it must be vain to look for justification by it. Those only are just or righteous who are freed from death and wrath, and restored into a state of life in the favour of God; and it is only through faith that persons become righteous.
Thus we see that justification by faith is no new doctrine, but was taught in the church of God, long before the times of the gospel. It is, in truth, the only way wherein any sinners ever were, or can be justified. Though deliverance is not to be expected from the law, there is a way open to escape the curse, and regain the favour of God, namely, through faith in Christ.
Christ redeemed us from the curse of the law; being made sin, or a sin-offering, for us, he was made a curse for us; not separated from God, but laid for a time under the Divine punishment. The heavy sufferings of the Son of God, more loudly warn sinners to flee from the wrath to come, than all the curses of the law; for how can God spare any man who remains under sin, seeing that he spared not his own Son, when our sins were charged upon him? Yet at the same time, Christ, as from the cross, freely invites sinners to take refuge in him."
I don't know about your story on the various gospels, AFV, but here's the real one, titled "WHAT IS THE GOSPEL?" (click here). It's in HTML. You can probably just highlight it, and cut it and paste it into a good word processor to read it.
But for your information, it's crucially important that you get the idea that the Bible says that a human's acceptance by God as His child only requires that he/she admits of his/her innate sinful character governs one's thoughts and actions, and is willing to turn from that life by yielding oneself totally and forever into the care of God's Son, the Jesus of the Bible, by trusting in God's promise that the yieldedness will result in the birth of a new spiritual person in the old human shell, never to be misused or forsaken.
That's one way of understanding the Gospel, the joyous news that salvation is free and instantaneous, with no guilt attached, sins gone, forgiven an forgotten by God, with spiritual growth to follow.
It also means leaving old false concepts of Jesus and The Father, and its religious system, as well as abandoning a false burden of having to slave away in "good" works to obtain a final ticket for Heaven; and instead freely entering into loving fellowship with the truly regenerated followers of The Lord and Christ in a local assembly of fellow believers, one which has been gathered by the Holy Spirit, delivered from the wrath of God, for the new convert's individual benefit and fruitful discipleship into spiritual maturity in the new life.
Jesus' promise for the reborn disciple is that upon physical death, as He promised the repentant and forgiven malefactor on Calvary with Him: "This day shalt thou be with Me in Paradise."
No Purgatory, no further condemnation, but rather peace in Him.
"There is therefore now no condemnation to them who are in Christ Jesus, who walk not after the flesh, but after the Spirit; for the Law of the Spirit--of Life in Christ Jesus--has made us free from the Law of Sin, and Death." (Romans 8:1-2;physical, spiritual, and eternal death is the wages of sin).