He was made a believer by Grace as is all true believers. He was a believer by the Grace of God 1 Cor 15:10
10
But by the grace of God I am what I am: and his grace which was bestowed upon me was not in vain; but I laboured more abundantly than they all: yet not I, but the grace of God which was with me.
BTW here is irresistible Grace, Grace made him a believer. In Eph 3:7 the word made is a creation word, to generate, its the word
ginomai :
- to become, i.e. to come into existence, begin to be, receive being
- to become, i.e. to come to pass, happen
ghin'-om-ahee; a prolongation and middle voice form of a primary verb
; to cause to be ("gen"-erate), i.e. (reflexively) to become (come into being
Technically Grace made him into a believing servant of Christ, and he had no choice in it. Thats the work of Sovereign Grace of God
Grace not determinism, made Paul what he was.
Grace is not a deterministic event.
Grace is resistible
To the Galations (2:21), Paul wrote, "I do not frustrate the grace of God" (by seeking righteousness through the works of the law rather than through faith in Christ). To the Corinthians he wrote (II: 6: 1), "We then, as workers together with God, beseech you also that you receive not the grace of God in vain" (by failing to go on with God in the unfolding of His redemptive purpose for them, cf. chap. 67)42 With respect to Calvin's hypothesis of irresistible grace, it is noteworthy that Hebrews 10:29 warns against "doing despite to the Spirit of grace." That the designation "Spirit of grace" appears in the context of Hebrews 10:19-12:29, the longest of the five hortatory sections of the Epistle to the Hebrews which treat the peril of apostasy with such profound urgency, strongly forbids any assumption of the irresistibility of grace. "My spirit shall not always strive with man," declared God in the days of Noah (Gen. 6:3). If the men of Noah's generation were foreordained to damnation, as Calvin believed, in what sense did the Spirit strive with them, since they were but fulfilling their foreordained role in refusing the testimony of Noah? If no man, either elect or reprobate, can resist the will of God, against whom or what is the Spirit striving when He "strives with man"? If there is in man no faculty of decision which God takes into account, any striving of the Spirit that fails to bring man to submission proves God incapable of performance. Any "striving" not intended to eventuate in the submission of man would be a farce and prove God hopelessly insincere. If decision rests with God alone, any striving at all is totally superfluous. "You always resist the Holy Spirit!" was Stephen's charge against his persecutors (Acts 7:51). If Calvin's hypothesis of irresistible grace were true, how could this be? If they were reprobates by eternal decree of God, in what sense could they be resisting the Holy Spirit by fulfilling their foreordained role in opposing the Gospel? Only as potential objects of election could it be possible for them to resist the Holy Spirit; and the record stands that they did indeed resist the Spirit of Grace. The doctrine of the irresistibility of grace is a theological fiction.
Matthew 23:37–38 (LEB) — 37 “Jerusalem, Jerusalem, who kills the prophets and stones those who are sent to her! How many times I wanted to gather your children together the way a hen gathers her young together under her wings, and you were not willing! 38 Behold, your house has been left to you desolate!
No scripture will state what you post
Technically Grace made him into a believing servant of Christ, and he had no choice in it.
Grace may be resisted, fallen short of, or given in vain.
Hebrews 12:15 (LEB) — 15 Take care that no one falls short of the grace of God; that no one growing up like a root of bitterness causes trouble, and by it many become defiled;
Men can fall short of grace so they can fail to obtain that which the given grace is able to provide
Acts 7:51 (LEB) — 51 “You stiff-necked people and uncircumcised in hearts and in your ears! You constantly resist the Holy Spirit! As your fathers did, so also do you!
The Spirit of grace is resisted
2 Corinthians 6:1 (LEB) — 1 Now because we are fellow workers, we also urge you not to receive the grace of God in vain.
Grace received in vain is not irresistible.