Well, Sanguinius, is probably meant to more represent Archangel Michael, although some, like Jehovah's Witnesses, belive Jesus and Archangel Michael, are one and the same. This most notably as in the Bible, only Jesus and Archangel Michael, are refered as "The Archangel".



The fatefull fight of Sanguinius and Horus, is probably an refernce/adaptation of Michael's and Satan's legendary fight, only that Horus, here the counterpart of Satan, won, if only to be later obliderated by The Emperor of Mankind.