Source: H. L. Green, The Free Thought Magazine, Volume 19, 1901, January to December (Chicago: 1901), 455-462.
SOME years ago Colonel Robert G. Ingersoll engaged in a controversy with General Charles H. T. Collis over the religion of Abraham Lincoln. Colonel Ingersoll contributed but two short letters to the discussion, as it soon became apparent to him that General Collis knew little or nothing of the real life of Lincoln. These two letters, however, together with the letters of General Collis, have recently been published by the latter in a little pamphlet entitled, "The Religion of Abraham Lincoln," in which is included also a letter from General Daniel E. Sickles and one from the Hon. Oliver S. Munsell, both of whom, like General Collis, attempt to prove that Abraham Lincoln was a Christian.
I have read carefully these letters of General Collis and his friends, and, beyond finding that Lincoln had…