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 :It would be just as incorrect to include him in a category of Baptists, despite his baptism as a child. The fact of his birth to formerly Jewish parents, and of his (presumably non-voluntary) baptism at the age of five, were of no relevance to Marx, and therefore of no relevance to this article. I repeat my question: what do you mean when you say he was Jewish? (Maybe we should have a category for the people Isaac Deutscher described as ""non-Jewish Jews?) "