Well there are far more problem with the position that just Saul
An examination of the NT teaching on regeneration shows
Regeneration is through the gospel
James 1:18 (NASB)
18 In the exercise of His will He brought us forth by the word of truth, so that we would be a kind of first fruits among His creatures.
1 Peter 1:23 (NASB)
23 for you have been born again not of seed which is perishable but imperishable, that is, through the living and enduring word of God.
1 Corinthians 4:15 (KJV)
15 For though ye have ten thousand instructors in Christ, yet have ye not many fathers: for in Christ Jesus I have begotten you through the gospel.
Predicated on the Resurrection of Christ
Romans 6:4 (KJV)
4 Therefore we are buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life.
Colossians 2:12, 13 (KJV)
12 Buried with him in baptism, wherein also ye are risen with him through the faith of the operation of God, who hath raised him from the dead.
13 And you, being dead in your sins and the uncircumcision of your flesh hath he quickened together with him, having forgiven you all trespasses;
Concurrent with the indwelling of the Holy Spirit
Ezekiel 36:25-27 (KJV)
25 Then will I sprinkle clean water upon you, and ye shall be clean: from all your filthiness, and from all your idols, will I cleanse you.
26 A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you an heart of flesh.
27 And I will put my spirit within you, and cause you to walk in my statutes, and ye shall keep my judgments, and do them.
Only in Christ
1 John 5:12 (KJV)
12 He that hath the Son hath life; and he that hath not the Son of God hath not life.
available through faith in Christ
John 1:12 —KJV
“But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name:”
1 Pet. 1:18–25 —KJV
“Forasmuch as ye know that ye were not redeemed with corruptible things, as silver and gold, from your vain conversation received by tradition from your fathers;
But with the precious blood of Christ, as of a lamb without blemish and without spot:
Who verily was foreordained before the foundation of the world, but was manifest in these last times for you,
Who by him do believe in God, that raised him up from the dead, and gave him glory; that your faith and hope might be in God.
Seeing ye have purified your souls in obeying the truth through the Spirit unto unfeigned love of the brethren, see that ye love one another with a pure heart fervently:
Being born again, not of corruptible seed, but of incorruptible, by the word of God, which liveth and abideth for ever.
¶ For all flesh is as grass, and all the glory of man as the flower of grass. The grass withereth, and the flower thereof falleth away:
But the word of the Lord endureth for ever. And this is the word which by the gospel is preached unto you.”
John 20:31 —KJV
“But these are written, that ye might believe that Jesus is the Christ, the Son of God; and that believing ye might have life through his name.”