Sanctification, justification, and Roman Catholic differences

In a “can’t we all just agree to disagree?” age, how do Christians know which doctrines are worth dividing over—and which ones faithful believers can disagree about in good conscience?

The New Testament repeatedly warns that false teachers will arise from within the church, twisting the gospel and drawing people away. But that raises a crucial question: what exactly counts as “the gospel,” and what beliefs are essential to salvation?

In today’s episode, I’m joined by David Geisler, who carries on the work of his father, Dr. Norman Geisler, to help Christians sort the difference between essential and non-essential doctrines—with clarity, charity, and conviction.

We also dig into the 2025 State of Theology research (Lifeway Research commissioned by Ligonier Ministries) and the results are sobering: many professing Christians are confused about core, gospel-defining doctrines like God’s nature, the Trinity, the resurrection, and human sin.

Together, we walk through 15 core essentials—doctrines that directly relate to salvation—and talk about why some truths may be logically necessary even if a new believer can’t articulate them yet. We also discuss why compromise may be one of the biggest threats to the church right now.

If you’ve ever felt confused by the endless “lists” online, or you’ve heard progressive Christianity flatten everything into the same category, this conversation will help you think clearly and biblically about what must be protected and how to pursue unity without surrendering truth.

Resources mentioned: Conviction Without Compromise: Standing Strong in the Core Beliefs of the Christian Faith by Norman Geisler & Ron Rhodes.

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