[Dr. Sivana]

This topic is covered in an informative (if not tightly written) little book entitled "Karl Marx, True or False Prophet?" by Deirdre Manifold (likely out of print but can be gotten from ABEbooks.com) Sample below:

[Intar]

Uh, no, he was Jewish and was educated in traditional Rabbinic school as a child, then went to college to study law. He was never a Christian.