[GOPJ]

Karl Marx was born and raised Lutheran. In all of his voluminous writings (including personal letters) there is not even a hint that he knew anything about Judaism beyond what any German would ‘know’ from the popular, anti-Semitic, press.

Why was he considered to be Jewish?

[jjotto]

He would be considered Jewish by Jewish religious law, AFAIK, which would be an OK association for one who accepts Jewish religious law.

Also, Jew-haters identify one as Jewish (or at least in on the Jewish conspiracy) on a basis as remote as one Jewish grandparent or even less. Sometimes just a ‘Jewish sounding’ last name will get one a Jew tag (the accused presumed to be covering up his Jewish affiliation).