Was Abraham Lincoln a Christian?

The testimony of Abraham Lincoln "consecrating" himself to Jesus was told in a sermon by the Reverend Isaac E. Carey on November 24, 1864, and subsequently published in the Freeport Weekly Journal on December 7, 1864.  Was Abraham Lincoln a Christian?  Carefully read the testimony found in the second column of text, in the second to last paragraph near the bottom:

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I add the text of a note I received from Dr. Mark Noll on February 14, 2015:
"Dear Hunter Irvine,
   Thanks much for sending this photocopy.  As you know very well, reports on Lincoln published before April 1865 are many times more valuable than those appearing afterwards.  This is a most interesting document.
   My best in all your efforts, Mark Noll"