Lincoln's Christianity by Michael Burkhimer

[Eva Elisabeth]

Wiki words it as follows:
"1865: Memory book
Following Lincoln's assassination a memory book, The Lincoln Memorial Album—Immortelles, in which people could write their thoughts includes some comments on Lincoln's religion. One entry, written by a well-known Presbyterian minister, the Rev. John H. Barrows, claimed that Lincoln had become a Christian in 1863 but provided no evidence..."[and then follows the said quote.]
I agree with Roger - I doubt Lincoln said this. While I do think there's reliable evidence he believed in (a probably Christian) God he never (reliably, to my knowledge) spoke of Jesus that way.