Are sinners “born again” as regenerated people before they believe in Christ or even have a single, God-fearing thought? What about Cornelius, the God-fearing Gentile in Acts 10 who had developed a long-standing reputation for being a devout man who feared God? Are we to assume he was born again years before hearing the gospel?
John Piper’s beliefs on being born again prior to faith leave him no “wiggle room” on the issue. For example he writes, “If you have one whisper of genuine desire for God in your heart, it is the work of God and the triumph of grace.” 
What sort of grace is Piper talking about? He answers that a few sentences later. “The centrality of God in saving grace is seen in God’s sovereign act of begetting his own children. We did not choose to be begotten any more than we chose to be raised from the dead or called or created. We were born “not of blood, nor of the will of the flesh, nor of the will of man, but of God” (John 1:12–13).” 
The careful reader will note how Piper attempts to quote John 1:13 to smuggle in the idea that one must first become a “begotten” child of God before one can even believe in God, much less “have one whisper of genuine desire for God in your heart.” However the idea that people become “born again” (i.e. begotten) children of God before they believe in Christ, can only be held at the expense of ignoring the preceding verse in John 1:12. Suspiciously this is exactly what Piper does. When verse 13 is read in the context of verse 12 it becomes clear being “begotten” or (regenerated, born again) as a child of God is in response to people’s prior receiving and believing in the Son. We read, “But to all who did receive him, who believed in his name, he gave the right to become children of God.”
Lets be clear about what John is saying. God did not give people “the right to become children of God” so that they can receive and believe. God gives them that right because they receive and believe. Becoming a regenerated child of God does not create faith so that we can believe—it is God’s sovereign response to faith because we believe. In no way does this mean we cause ourselves to be “born again.” For example the choice to believe in the Son is an act of the human will in response to God’s preceding, drawing grace.
However God’s choice to honor our belief by regenerating us anew in Christ is solely an act of his will. So while our belief in the Son results in our being born anew of God’s will—or “born again”— our belief is not the regenerating power/cause of new creation. By faith we are indeed placed in Christ, but becoming a new, regenerated creation in Christ requires a miracle of God’s power—hence we are “born of God.” Calvinists often err in confusing (A) the condition of faith to become reborn in Christ with (B) God’s miracle of rebirth in Christ. Just as we should not confuse the flipping of a switch that turns on a light with the electricity that powers that light, so also faith may bring us into union with God, but the new creation that is birthed out of that union is “powered” by God alone.
Piper attempts another approach to secure his view that sinners “dead in sin” must first be “born again” (regenerated) as a sovereign act of new creation and saving grace before they can believe in Christ. In the same sermon teaching he states, “The centrality of God in saving grace is seen in the sovereign act of new creation. A new creation happens when God says to a soul blinded by the god of this world, ‘Let there be light . . . and [creates in the darkened soul] the light of the knowledge of the glory of God in the face of Christ’” (2 Corinthians 4:6).”
“The true light, which gives light to everyone, was coming into the world. He was in the world, and the world was made through him, yet the world did not know him. He came to his own, and his own people did not receive him” (John 1:9-11).
Piper assumes that if we people are saved by grace, but not all are saved, then God’s saving grace— being understood as the light of the gospel in the face of Christ—must be a selective impartation of light that is sovereignly irresistible. However both the selective and irresistible nature of God’s light in the face of Christ is again undermined in the gospel of John.
Contrary to Piper’s claims, the light of God’s grace in the face of Christ can be rejected. Therefore it does not act upon sinners as an irresistible force or “sovereign act of new creation” that causes faith. Not even the context of Piper’s specific appeal to 2 Corinthians 4:6 aids his argument. As with John 1:9-11 the context is again unbelieving Jews whose stubborn resistance to the light of Christ is rendering them spiritually hardened and veiled behind the former glory of an old covenant passing away. Paul states both the problem and the solution back to back.
“Yes, to this day whenever Moses is read a veil lies over their hearts. But when one turns to the Lord, the veil is removed” (2 Cor. 3:15-16).
The “when” and “how” of this passage reveals both human and divine agency. When is the veil removed? Only “when one turns to the Lord.” How is “the veil removed”? By a sovereign work of God. This is worth exploring more. The veil is not first taken away so that unbelievers can turn to Christ. It is removed as a result of turning to Christ. Whether we take it in a temporal or causative sense, the veil is taken away only in response to turning to Christ. This “turning to” is biblically understood as repentance—a word that literally means to “turn away from” and turn towards a new direction.
Herein we find the true balance of scripture between the God-intended, free will of human imagers of God and the sovereign will of God. As the light of the gospel goes forth the choice to repent and turn to the Lord is an act of the human will in response to that light. The veil over the heart is then removed as a sovereign act of God. The order is not to be missed. Turning to the Lord as an act of repentance precedes the sovereign work of God removing the blindness of the veil.
And we don’t need to waste time wondering if God has granted all Gentiles and Jews as a collective whole the opportunity of repentance to life.  The early church was hesitant to affirm this equal standing before God until the episode with Cornelius burst the old wineskin of their restrictive thinking. Afterwards they declare, “Then to the Gentiles also God has granted repentance that leads to life” (Acts 11:18).
One cannot minimize this declaration as meaning God only grants a selective repentance to some Gentiles, but not all. The entire teaching point of Cornelius to the early church was that Gentiles as a collective whole are no longer unclean. Hence they recognized God was granting repentance and the unfettered gospel to all Gentiles—not just some. To insist God selectively grants repentance to some but not all, because God does seek the salvation of all, completely overthrows Peter’s declaration that God is “not wishing that any should perish, but that all should reach repentance” (2 Pt. 3:9). 
With this in place lets return to Piper’s earlier appeal to 2 Corinthians 4:6 to justify irresistible, saving grace that brings about new creation prior to faith in Christ. Remember Piper holds that unless sinners, blinded by Satan, are first regenerated as a “sovereign act of new creation” they can neither “have a whisper of desire for God”, nor believe in God. For this reason Piper claims, “A new creation happens when God says to a soul blinded by the god of this world, ‘Let there be light . . . and [creates in the darkened soul] the light of the knowledge of the glory of God in the face of Christ’ (2 Corinthians 4:6).”
It is true the light of God’s glory in Christ has been shown in the hearts of believers, but the basis of beholding that glory was given earlier by Paul in the preceding chapter, “And we all, with unveiled face, beholding the glory of the Lord, are being transformed in the same image…”
Paul says we behold the glory of the Lord, not with a veiled face, but an unveiled face. How and when does a sinner become unveiled? Paul already told us that too when he said the veil is removed “when one turns to the Lord” (3:16).
The order Paul presents to us is as follows: Turning to the Lord results in a sovereign unveiling > The removal of the veil allows us to behold the glory of God > Beholding the glory of God leads to transformation (i.e. regeneration).
If any Bible teacher, no matter how honored and esteemed, tries to teach sinners must be regenerated and “born again” as a sovereign act of new creation before they can turn to Christ in faith, they have a defective, theological view.
With all this said how should be understand being “born again” as God’s sovereign act of regeneration in Christ? Answering this question will help us understand Cornelius’s God-fearing faith and worship prior to knowing the gospel and yet later being saved through the gospel. True it is that being “born again” is God’s miracle of new creation that causes us to pass from death to life in a moment in time. But that is the very definition of salvation! And the scriptures are clear salvation does not precede faith—it is the result of faith.
Piper places salvation, becoming a “begotten” child of God as a “triumph of grace” that occurs prior to having even a “whisper of genuine desire for God in your heart.” This is thoroughly misguided and unbiblical—but it is the greasy oil that keeps the machinery of Calvinism running without locking up, while simultaneously “locking out” multitudes of people from God’s redeeming love (Jn. 3:16) and desire that “all people be saved and come to a knowledge of him…” (1 Tm. 2:4). And lest we think God’s desire that all be saved is vacuous and lacking purposeful intentionality, Paul backs it up by highlighting God’s purposeful, grace-filled action to see it fulfilled through his mediator “Christ Jesus… [who] gave himself as a ransom for all” (vs. 6).
 John Piper at: https://www.desiringgod.org/messages/the-god-centered-ground-of-saving-grace
 John Piper at: https://www.desiringgod.org/messages/the-god-centered-ground-of-saving-grace
 In the case of Cornelius he was demonstrating far more than just a “whisper of genuine desire” towards God! Therefore Piper is forced to assume Cornelius was already a “born again” child of God—long before he heard the gospel and was saved.
 Being granted something is distinct from being forced into something. God’s “granting of repentance” should be seen as an opportunity for repentance in much the same way Paul sees persecution as an opportunity to suffer for Christ’s sake, telling Timothy “it has been granted to you… [to] suffer for Christ’s sake.” (Ph. 1:29). Paul did not mean by this that Timothy was being forced to suffer, only that Timothy should view his hardships as opportunities from God to identify with the sufferings of Christ and likewise suffer for his sake.
 The context is Peter’s comparison of the present world with the former world that was judged at the time of the flood. God was patient towards that former generation too, but God’s patient long-suffering has a limit. And when that former generation did not repent, the opportunity for further repentance closed and the time of judgment commenced. So too God is long-suffering with our present world, but his patience will not be infinite. Therefore Peter says God desires that “all people…should reach repentance”—i.e. while they still can. For this world is being stored up for judgment and when the time of judgement comes, the time of repentance is over.