Joshua Zeitz, author of 'Lincoln's God: How Faith Transformed a President and a Nation', delves into Abraham Lincoln's intriguing spiritual journey. He explores how Lincoln evolved from skepticism to spiritualism, particularly during the tumultuous Civil War. The conversation uncovers the impact of Lincoln's unique relationship with religion on his political decisions and personal life, including the influence of his wife Mary Todd Lincoln's beliefs. Zeitz also highlights the Northern churches' pivotal role in supporting the Union and shaping Lincoln’s rhetoric.