In Lincoln’s God, historian Josh Zeitz explores how Abraham Lincoln’s evolving religious beliefs profoundly shaped his presidency—and the moral framework of the Civil War. The book traces Lincoln’s journey from secular skeptic to a leader who invoked divine justice and national reconciliation in his most critical speeches and decisions.

Zeitz draws on speeches, personal writings, and contemporary accounts to reveal a president grappling with theology, providence, and the meaning of suffering. More than a biography, Lincoln’s God is a meditation on how religion, war, and leadership intersected at a turning point in American history.