Many of the old Jewish practices were based on sound health and hygiene principles at the time. Unfortunately, many of them (particularly the dietry requirements and those relating to contact with the deceased) no longer apply but nevertheless male circumcision does seem to have a correlation with prevention both of AIDS HIV and cervical cancers.

I don't think I ever suggested that left wing principles were in any way inconsistent with Christian principles, at least those that advocated loving thy neighbour as thyself.