For better or worse, Ladislaus, the claim that Lincoln was ever a Catholic amounts to hearsay; that is, it is not substantiated by formal docuмentation of any sort. What is more, Lincoln himself asserted that he was never baptized, and Mary Todd Lincoln vehemently seconded that assertion to the end of her own life.
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You say the above, Claudel, on that other thread you linked to. But Incredulous did have a few references cited. Which is about as much as would be available since the fix was in to cover Lincoln's Catholicism. He was, indeed, born and brought up in early youth in the "Holy Land"-Catholic section of central KY, before moving out of state when still young. Big deal that he and his wife denied his baptism, etc. It worked politically. Besides, that, perhaps, that is all Mary Todd knew of him - as much as he exactly was pleased to tell her, or maybe they both agreed to put some kind of space between him and Christianity. Why is it you are so against Lincoln being Catholic? Or is there something else to this?