Melanie Cornell at the Illini Secular Student Alliance offers her take on which of our presidents might have been closeted atheists:

Considered Lincoln’s closest acquaintance, William Herndon attempted to describe the sheer complexity of Lincoln’s religious views, stating Lincoln was “at times, an atheist.” He also claimed Lincoln was a follower of Darwin (before it was cool). But Lincoln’s many speeches often contained references to the lord Almighty, providence, and all that jazz. Was it just a front?
Make sure you read to the bottom for the Honorable Mentions list 🙂