There is absolutely nothing in the genealogical records for the Sizemores, or the DNA results of the participants, that indicates any genetic Jewish connection. Nor does the Sizemore surname appear in the article: http://en.wikipedia.org/wiki/Bartolom%C3%A9_de_las_Casas
See my postings on this message board in 2003:http://boards.ancestry.com/topics.religious.jewish.sephardic...
Admin of the Sizemore DNA project:
My posting to the Sizemore message board:http://boards.rootsweb.com/surnames.sizemore/2726/mb.ashx
The up to date DNA results:http://www.familytreedna.com/public/SIZEMORE_DNA