trouble with those so called gospels for Jew and Gentile is the truth states neither apply in Christ Galatians 3:28 so these labels/SYMBOLS are mere rungs on the truth ladder. Paul mentioned he played those roles 1Cor 9:19-23 to what? win them over to the truth! only ONE truth that no religious label can corral except in the mind of man, his god ruling in time. The Eternal kingdom had no beginning and it certainly isn't time based, you are stuck in a life time.
Sort of...
I mean, the entire Book concerns one CENTRAL figure: The Lord Jesus Christ.
Concerns God's Two-Fold Purpose in His Son by the Spirit, over The Earth AND The Heavens.
BOTH centered in His Son...
Ephesians 3:15 Of whom the whole family in heaven and earth is named,
In this, be it that aspect of what had been "spoken...of...since the world began" Acts 3:21, or that aspect of what had been "kept secret since the world began" within every so called "gospel" Rom. 16:25, actually having been merely a further development in, and towards that eventual, revelation of the FULL knowledge of Him.
Acts 3:21 Whom the heaven must receive until the times of restitution of all things, which God hath spoken by the mouth of all his holy prophets since the world began.
In contrast to...
Romans 16:25 Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began, 16:26 But now is made manifest, and by the scriptures of the prophets, according to the commandment of the everlasting God, made known to all nations for the obedience of faith: To God only wise, be glory through Jesus Christ for ever. Amen.
And properly understanding all that depends on each our Study Approach, together with how open we each actually are to being informed, ours has possibly been the result of a mis-fire in approach somewhere.
Sort like those two in the following...
2 Timothy 2:18 Who concerning the truth have erred, saying that the resurrection is past already; and overthrow the faith of some.
2:20 But in a great house there are not only vessels of gold and of silver, but also of wood and of earth; and some to honour, and some to dishonour.
Rom. 5:6-8.