What Catholics Believe
What Is Sin? A Catholic Guide to Original Sin, Mortal Sin, and God's Mercy
Episode 4
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14-Oct-2026
What is sin, and why does it matter? In this episode of What Catholics Believe, Dr. James Prothro explains the Catholic understanding of sin—from the Fall of Adam and Eve and original sin to the difference between mortal and venial sin. He also unpacks the seven deadly (capital) sins, how to form your conscience, and why confession is central to the Christian life.
You'll also learn what the Church teaches about the "unforgivable sin," how to know whether something is sinful, and why God's mercy is always greater than our failures. Whether you're new to the Catholic faith or looking to deepen your understanding, this episode offers a clear, Scripture-based introduction to one of the most important topics in Catholic theology.
Explore the Sacrament of Confession and God's Mercy with Forgiven: https://app.formed.org/app/collections/115608
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