Abraham Lincoln had an interesting Christian Testimony which is shown on the following link by "In Touch" Ministries =>
The photo shown is from the Norman Rockwell Museum in Stockbridge, Massachusetts. For more information about the museum, click here. For a larger version of the photo, click on it.
For more information about Norman Rockwell's art, look at this page: Norman Rockwell art
I will be listing many more famous Christians from this page in the future.