"Free will" in the Bible? ~ Freedom is something believers are called to (Galatians 5 verse 13). We need Jesus to “set us free” (Galatians 5 verse 1). If Jesus has not freed us from the bondage of sin, then we are still slaves to sin (Romans 6 verses 6-7). Freedom is found in the presence of the Spirit (2 Corinthians 3 verse 17). Only Jesus can give us true freedom (John 8 verse 36). Only through His lovingkindness can we truly make choices unfettered by a nature that is inherently hostile toward God.
Yes, Jesus frees souls from slavery to sin, enabling them to believe and be saved in heaven.
The pre-incarnate Jesus/Spirit of God did the same for pre-NT souls, most notably Abraham per Romans:
7. Romans 2:11 teaches that “God does not show favoritism” (cf. Eph. 6:9, Col. 3:25, 1Pet. 1:17), which is how God judges people justly, so the fact that some sinners ignore God’s Gospel indicates that His will or leading is resistible because of MFW.
8. Romans 2:15 teaches that sinful souls have a conscience or awareness of “the requirements of the law”, which may be combined with Romans 1:20 to teach that God’s power and moral nature or will may be perceived via creation and conscience (called natural revelation), thus those unfamiliar with God’s Word in Scripture have no good reason for resisting divine leading and choosing atheism/evil.
9. Romans 3:20-21 states the law makes souls conscious of sin and that “the Law and Prophets testify” or prepare the way for the new revelation of righteousness from God apart from the Law, which takes up where Romans 1:17 left off.
10. Romans 3:22a says that “righteousness from God” or s/e comes through faith “in Jesus Christ” (cf. Eph. 2:8), a phrase Paul used eleven times in Ephesians 1:3-14 to indicate s/e.
11. Romans 3:22b says that God’s righteousness is given “to all who believe—there is no difference”” signifying that all sinners may believe or be s/e (cf. 1Tim. 2:3-4, John 3:16, Tit. 2:11), because there is no favoritism (#7).
12. Romans 3:23 teaches that “all have sinned and fall short of the glory of God”, meaning that no one can be good enough to earn salvation because of their own merit.
13. Romans 3:24 says sinners “are justified freely by his grace through the redemption that came by Christ Jesus” (via faith per v.22, cf. 3:27-28); s/e is free because Christ paid the price/cost.
14. Romans 3:25a explains redemption as being “a sacrifice of atonement” for those who have faith in Christ’s work of dying in their place.
15. Romans 3:25b further explains that God demonstrated his just patience (#3) or forbearance in leaving unpunished those sins committed before the revealing of the Gospel (foreshadowed in Gen. 22:8 & 13), implying that sinners had/have the opportunity to believe and be s/e thereby demonstrating God’s justice/not showing favoritism (#11).
16. Romans 3:26 continues to emphasize divine justice by declaring it three ways (“justice…, just…, justifies”), which justness is synonymous with righteousness (2Thes. 1:5-6, Heb. 6:10).
17. Romans 4:1-25 presents Abraham as a Gentile who became the physical father of the Jews and the spiritual father of all who choose to have faith in God/Christ.
18. Romans 5:1 echoes Eph. 2:8 by describing s/e as justification through faith, Eph. 1:5 & 7 by using the phrase “through Jesus Christ”, and Eph. 2:14 by describing s/e as having peace with God.
19. Romans 5:2 & 5 also echo Eph. 2:18 & 3:1 by describing s/e as having access to God’s grace via the Holy Spirit.
20. Romans 5:6-10 states that God’s love (cf. kindness in #3) for the ungodly, for sinners and for His enemies is demonstrated by Christ dying for their s/e or justification/reconciliation.
21. Romans 5:12-21 describes s/e in corporate terms, saying that–like the first man–all (many?) men also sinned and died, and God’s grace comes to all (many?) because of Jesus Christ.
22. Romans 6:1-14 describes s/e in terms of Christians being united with Christ’s death and resurrection, so they who are under grace should not allow sin to reign in their bodies but should instead serve God as instruments of righteousness.
23. Romans 6:15-23 describes s/e in terms of being slaves to whom one willingly obeys, whether to sin or to obedience of God’s teaching that leads to righteousness, which results in eternal life “in Christ Jesus our Lord” (cf. #10).