I'm not.

Superman never had any 'Jewish roots'. Neither Siegel nor Shuster were observant Jews. Religion meant little to them. Superman's roots are in pre-1938 science fiction books and pulps, and the murder of Siegel's father.

All of the religious baggage - of any denomination - that's been foist on Superman has come from later creators or scholars trying to hijack the character for their own purposes, and who have little or no idea what was in Siegel's head when he crated him.