Short answer: The most‑likely author is the Apostle Paul. Evangelicals affirm Paul as the inspired, authoritative writer of Galatians and view him as the apostle who taught justification by faith and the unity of believers in Christ—the very themes expressed in Galatians 3:26–28.

Key points evangelicals emphasize about Paul and this passage

– Authorship and authority
– Galatians opens with Paul identifying himself as the author and apostle (Gal. 1:1). Early church testimony (Irenaeus, Tertullian, etc.) and the letter’s style and theology strongly support Pauline authorship.
– Evangelicals accept Paul as God’s chosen apostle (Acts 9; 1 Cor. 15:8–10) whose letters are canonical Scripture and authoritative for doctrine and life.

– Paul’s background (how evangelicals summarize him)
– Born Saul of Tarsus, a Jew of the tribe of Benjamin and a Pharisee trained under Gamaliel (Phil. 3:5; Acts 22:3).
– Persecuted the early church until a conversion on the road to Damascus (Acts 9), after which he became the primary missionary to the Gentiles.
– Undertook several missionary journeys, planted churches across Asia Minor and Europe, supported himself as a tentmaker, and faced imprisonment and martyrdom (traditionally under Nero).

– Theological perspective relevant to Galatians 3:26–28
– Central theme: justification by faith in Christ alone, not by works of the law. Galatians combats the teaching that Gentile believers must adopt Jewish law to be saved.
– Union with Christ: Paul teaches believers are “in Christ” (a key Pauline concept). Gal. 3:26–28 emphasizes that through faith and baptism believers are united to Christ and thus share the same new identity.
– Equality in salvation: “For you are all sons of God through faith in Christ Jesus. For as many of you as were baptized into Christ have put on Christ. There is neither Jew nor Greek, slave nor free, male nor female, for you are all one in Christ Jesus” (Gal. 3:26–28, ESV). Evangelicals read this as a clear statement that social, ethnic, and gender categories do not determine standing before God—salvation is by faith alone and applies equally to all.

– How evangelicals apply the verse
– Emphasis on unity: Christians from differing backgrounds are one body in Christ; churches should reflect unity, mutual love, and equal worth of all believers.
– Baptism and identity: Baptism is viewed as the gospel sign that pictures and publicly acknowledges union with Christ (Romans 6:3–4; Gal. 3:27). It does not add to justification but marks entrance into the new identity.
– Practical implications: Evangelicals use the passage to argue for the church’s inclusion of Gentiles, to oppose ethnic or social discrimination, and to affirm equal spiritual standing before God. On specific questions of church leadership roles, evangelicals differ (egalitarian vs. complementarian) while commonly agreeing that Galatians teaches equal value and salvation for all.

– Historical setting of Galatians
– Written early (mid‑50s AD) to churches in Galatia to counter Judaizing teachers who insisted on circumcision or law‑keeping for salvation. The letter is strong in tone because Paul defends the gospel of grace.

If you’d like, I can:
– Give a short verse‑by‑verse explanation of Galatians 3:26–28 from a typical evangelical commentary;
– Summarize how different evangelical traditions (egalitarians vs. complementarians) apply this passage to church leadership and gender roles.