Theo Who?: The Beliefs That Define Us

by Eric Chaffin

What do Christians really believe—and why does it matter? Theo Who? The Beliefs That Define Us is a clear, accessible introduction to the core doctrines of the Christian faith written for everyday believers, not just pastors and seminary students. With warmth, biblical depth, memorable illustrations, and practical application, this book explores foundational truths such as Scripture, the nature of God, the Trinity, humanity, sin, salvation, Jesus Christ, the Holy Spirit, the church, and the end times. Rather than treating theology as dry academic theory, it shows how doctrine shapes worship, strengthens faith, answers life’s hardest questions, and transforms the believer’s daily walk with Christ. Whether you are a new Christian, a growing disciple, or a church member wanting a stronger biblical foundation, this book will help you understand not only what Christians believe—but why those beliefs define us.

314 pages, Kindle Edition

Published June 1, 2026

Reviews

[Matthew Robinson · Rating 5 out of 5]

A Great Tool!

This book is an extremely useful tool for any serious Christian. It lays out foundational Christian theology in easy to understand blocks. The tone is conversational without watering down any beliefs. I highly recommend reading it.