They are not Jews, and certainly not "rabbis". There are thousands of devout, worshipping Socialists who infest among Jews. In NYC they have gay synagogues, Communist synagoges, etc. They can call them whatever they like...they are not Jewish houses of worship. No self-respecting Orthadox rabbi would ever object to such a Christian prayer, just as no true Christian objected to hearing prayers spoken at the Challenger service read in Hebrew.
Thank you for that perspective.