From John’s Gospel To Nicaea: How Christians Confessed One God In Three Persons (WCF 2)

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The fastest way to misunderstand Christianity is to treat the Trinity like a math puzzle or a dusty debate from the fourth century. We pick up Westminster Confession of Faith chapter two and follow the doctrine of the Trinity where it actually comes from: the Bible’s own speech about the Father, the Son, and the Holy Spirit, with the Gospel of John front and center. Drew Brackbill helps us connect Scripture, church history, and the real-world stakes of orthodox Christian doctrine.

From the apostle John’s insistence on the Word’s full divinity to the Anti-Nicene Fathers like Ignatius, we trace how Trinitarian theology shows up early and clearly before any ecumenical council meets. Then we explain why the word “Trinity” appears later than the belief, how terms like “one substance” (consubstantiality) help the church speak precisely, and why that precision is meant to protect biblical faith rather than replace it.

We also walk through the major Trinitarian controversies that shaped the early church: modalism (Sabelianism) and Arianism, why they sounded persuasive, and why the Council of Nicaea and Athanasius mattered. Finally, we bring it into the present with modern examples and the ongoing question of creeds, confessions, and “no creed but the Bible.” If you care about the atonement, salvation, and faithful worship, this conversation lands close to home.

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