The most likely author of ‘2 Corinthians 3:6’ is the Apostle Paul. From an evangelical Christian perspective, Paul is considered one of the most significant figures in the early Christian church and is known for his extensive contributions to the New Testament through his letters, often referred to as epistles.

In 2 Corinthians 3:6, Paul writes, “Who has made us sufficient to be ministers of a new covenant, not of the letter but of the Spirit. For the letter kills, but the Spirit gives life” (ESV). This verse is part of a broader discussion about the ministry of the Spirit versus the ministry of the law, emphasizing the transformative power of the new covenant in Christ.

Here is some background about Paul that is relevant from an evangelical perspective:

1. **Background and Conversion**: Paul, originally known as Saul of Tarsus, was a zealous Pharisee who initially persecuted Christians. His dramatic conversion experience on the road to Damascus, where he encountered the risen Christ, set him on a new path as one of Christianity’s most fervent apostles.

2. **Apostolic Authority**: As an apostle, Paul claimed authority from Christ to preach the gospel and to guide the early church. His letters often address issues of theology, church practices, and moral conduct, highlighting his role as a teacher and leader.

3. **Theological Contributions**: Paul’s writings contributed significantly to Christian theology, particularly the concepts of grace, faith, and the work of the Holy Spirit. In 2 Corinthians, Paul discusses the contrast between the old covenant (the Law) and the new covenant (the grace of Christ), underscoring the life-giving nature of the Spirit.

4. **Missionary Work**: Paul undertook several missionary journeys, establishing churches in various regions of the Roman Empire. His letters were often responses to specific issues faced by these communities, providing doctrinal teaching and practical guidance.

5. **Legacy**: Paul’s influence on evangelical Christianity is immense, as many evangelical theologians and leaders draw on his writings for teaching and doctrine. His works remain foundational in understanding Christian faith and practice.

In summary, from an evangelical Christian perspective, the Apostle Paul is recognized as the author of 2 Corinthians 3:6, and his teachings in this verse highlight the significance of the new covenant and the work of the Holy Spirit in the life of believers.