This work is a summary and analysis of Abraham Lincoln's religion. This study begins with a description of the earliest relations Mr. Lincoln had with religion, his parents' dedication to a sect known as the "Separate Baptists." By late adolescence, Lincoln began to reject his parents' faith, and he appears to have been a religious skeptic until his marriage to Mary Todd. After his marriage, he attended Protestant services with his wife and family, but there was little evidence that he was deeply religious in that time. Lincoln knew the Scriptures quite well, but it was not until the death of his two sons, Eddie in 1850 and Willie in 1862, that as the sixteenth president put it, "He became more intensely concerned with God's Plan for human kind."