Though Abraham Lincoln was neither baptized nor joined a church of any kind, he was the most spiritually minded president in American history. His faith was wrought on the anvil of anguish, both personal and national, and because of this he has much to teach us in our own age of anxiety. (Timothy George, “Lincoln’s Faith and America’s Future”)
Timothy George is Dean of the Beeson Divinity School at Samford University and one of the real leaders in Southern Baptist life. He taught me Church History at Southern Seminary in the early 80’s and I’ve been an admirer of his spiritual insight and historical understanding every since. Here’s the link to his recent article showing not only the high level of spiritual maturity of President Lincoln but also, by contrast, the low level of spirituality by most of the presidents since.
http://www.firstthings.com/web-exclusives/2014/02/lincolns-faith-and-americas-future