Unashamed Truth

What does it take to revitalize a struggling church?

In this episode of the Unashamed Truth Podcast, Grant Castleberry sits down with Jon Benzinger, pastor of Redeemer Bible Church in Gilbert, Arizona, to discuss the biblical convictions that shaped the revitalization of his church.

Jon shares how a declining and unhealthy congregation was strengthened through a renewed commitment to the Word of God, prayer, expository preaching, biblical leadership, and intentional shepherding. He also discusses the importance of training elders, caring for church members, building strong pastoral teams, and remembering that the church belongs to Christ, not to the pastor.

This is a practical and encouraging conversation about trusting God to bring health and renewal to His church through ordinary, faithful ministry.

The conversation explores:
• Church revitalization through the Word and prayer
• The pastor as an under-shepherd of Christ
• Training and investing in elders
• Why expository preaching matters
• Preaching for transformation, not merely information
• and more …

Whether you are a pastor, church leader, or simply someone who loves the local church, this conversation offers practical wisdom for pursuing faithful, biblical ministry.

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In this episode of the Unashamed Truth Podcast, Grant Castleberry shares the personal story of how he became a Calvinist through studying Scripture.
Grant reflects on how the doctrines of God’s sovereignty, election, human depravity, and grace reshaped his understanding of salvation. He also explains why these truths matter for humility, worship, evangelism, and giving all glory to God.
Ultimately, this episode is not about embracing a theological label, but about submitting our understanding of salvation to the Word of God.
Watch this very personal episode on our YouTube Channel.

In this episode of The Unashamed Truth Podcast, Grant Castleberry sits down with David Schrock, pastor of preaching and theology at Occoquan Bible Church in Virginia, and co-founder of Christ Over All, for a wide-ranging conversation about the doctrines of grace and the sovereign work of God in salvation.

David explains how the Father purposes salvation, the Son accomplishes redemption, and the Holy Spirit applies the work of Christ to His people. Together, they discuss human depravity, election, regeneration, perseverance, and especially the doctrine of definite atonement, considering what Scripture means when it teaches that Christ gave His life for "His people."

This is a thoughtful and encouraging discussion about the grace of God that saves sinners, keeps them, and brings them safely to glory. You don't want to miss it! 
Watch this interview on our YouTube Channel.

Join Grant Castleberry as he welcomes Dr. Keith Mathison, theologian, author, and the inaugural R.C. Sproul Chair of Systematic Theology at Reformation Bible College, for a fascinating conversation on the life, legacy, and theological influence of Dr. R.C. Sproul. Dr. Mathison shares his own journey to faith, his years of working alongside Sproul, and the providential path that led him from Texas to Ligonier Ministries and Reformation Bible College.
The conversation explores Sproul's lasting impact on the resurgence of Reformed theology, his remarkable gifts as a teacher and communicator, and his passion for equipping ordinary Christians with sound doctrine. Grant and Keith also take a deep dive into classical apologetics, discussing how Christians can defend the faith with both biblical fidelity and intellectual rigor. 
Topics include the existence of God, the authority of Scripture, the role of miracles, the relationship between faith and reason, and how believers can answer the moral and philosophical objections raised by today's culture.
Whether you've benefited from R.C. Sproul's ministry for decades or are just discovering his work, this episode offers a compelling look at one of the most influential theologians of the last century while equipping Christians to confidently proclaim and defend the truth of the gospel.
Watch the interview by visiting our YouTube Channel.

In this episode of the Unashamed Truth Podcast, Grant Castleberry is joined by Dr. John Tweeddale, Vice President and Professor of Theology at Reformation Bible College, to explore the remarkable life and ministry of James Montgomery Boice. Though often overlooked today, Boice helped shape modern Reformed evangelicalism through his unwavering commitment to biblical authority, expository preaching, and confessional theology.
Together they discuss Boice's ministry at Tenth Presbyterian Church, his influence on leaders such as R.C. Sproul, John MacArthur, John Piper, and Tim Keller, his leadership in the Chicago Statement on Biblical Inerrancy, and his role in founding the Philadelphia Conference on Reformed Theology. Along the way, they reflect on Boice's preaching, his passion for mentoring younger pastors, and why his example remains so needed for the church today.
Whether you're a pastor, ministry leader, or simply want to learn from one of the most influential yet underappreciated figures of the twentieth century, this conversation will encourage you to stand firmly on the authority of God's Word and faithfully proclaim Christ to the next generation. 
Watch this episode on our YouTube Channel.