How Augustine’s Gnostic Past Influenced Christian Theology Forever
Soteriology 101 w/ Dr. Leighton Flowers
teaching
October 25, 2025
Did Augustine actually invent the modern idea of original sin—and was it influenced by Gnosticism and Manichaeism rather than Scripture? In this eye-opening conversation, we unpack how Augustine’s shift from a traditional view of free will to a deterministic theology changed the course of Christian thought for centuries.
You’ll discover how Augustine’s 10 years as a Manichaean may have shaped his later teachings on infant baptism, predestination, and the imputed guilt of Adam—concepts that eventually inspired Calvinist doctrine and debates that still divide the Church today.
Join us as we trace the timeline of Augustine’s writings, his secret revisions, and the pivotal debates with Pelagius that gave birth to one of the most controversial doctrines in church history. Whether you’re a theology student, pastor, or just curious about Christian origins, this episode will challenge what you thought you knew about sin, salvation, and sovereignty.
Check out the full video here:
https://www.youtube.com/watch?v=BnOMORGM2Qw
Timestamps:
00:00 – Why Study Augustine’s Shift in Theology
00:39 – When Augustine Changed His Mind
02:00 – Augustine’s Gnostic & Manichaean Roots
03:20 – Determinism vs. Free Will in Ancient Thought
05:28 – The Birth of Infant Baptism Doctrine
06:58 – The Debate with Pelagius
08:01 – Augustine’s View of Baptismal Regeneration
09:59 – Original Guilt: Augustine’s Innovation
11:21 – Manichaean Influence on Christian Doctrine
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Topics
augustineoriginal singnosticismmanichaeismpelagiuscalvinismfree willdeterminismchristian historyearly church












