Sorry 2 Cor 4:3-4 does not state the gospel is hid to allUntil one is saved by the new birth, the Gospel is hidden to them 2 Cor 4:3-4
3 But if our gospel be hid, it is hid to them that are lost:
4 In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them.
Cant believe what you cant see, whats hidden from your mind
2 Corinthians 4:4 (LEB) — 4 among whom the god of this age has blinded the minds of the unbelievers, so that they would not see the light of the gospel of the glory of Christ, who is the image of God.
again you simply ignore scripture
You ignored scripture again
The new birth is through the gospel
James 1:18 (LEB) — 18 By his will he gave birth to us through the message of truth, so that we should be a kind of first fruits of his creatures.
1 Corinthians 4:15 (LEB) — 15 For if you have ten thousand guardians in Christ, yet you do not have many fathers, for in Christ Jesus I fathered you through the gospel.
1 Peter 1:18–25 (LEB) — 18 because you know that you were redeemed from your futile way of life inherited from your ancestors not with perishable things like silver or gold, 19 but with the precious blood of Christ, like that of an unblemished and spotless lamb 20 who was foreknown before the foundation of the world, but has been revealed in these last times for you 21 who through him are believing in God, who raised him from the dead and gave him glory, so that your faith and hope are in God. 22 Having purified your souls by your obedience to the truth for sincere brotherly love, love one another fervently from the heart, 23 because you have been born again, not from perishable seed but imperishable, through the living and enduring word of God. 24 For “all flesh is like grass, and all its glory like the flower of the grass. The grass withers and the flower falls off, 25 but the word of the Lord endures forever.” And this is the word that has been proclaimed to you.