WHat one questions is how he leads others in prayer.
He is saying a prayer out loud and I expect that he will pray in the manner he is accustomed.
I think it is offensive and arrogant that you want to dictate the words this man is allowed to say. NEVER would I be so disrespectful as to demand that a Catholic priest not mention Mary in a public prayer. Nor would I complain if a Rabbi mentioned his yet to come Messiah. It's called tolerance and it's a two way street.