The opposite. Money lenders were non-christians, because Christians were forbidden from charging interest. It is also easier to excommunicate a money lender if

The opposite. Money lenders were non-christians, because Christians were forbidden from charging interest. It is also easier to excommunicate a money lender if they aren't a fellow Christian, so the arrangement was actually to the benefit of Christians. What you are doing is "affirming the consequent". Most Jews were working normal jobs (obviously excluding the ones they were legally barred) like everyone else.