Ok, I responded with a firm but slightly vague: due to the diversity of our student body and the young age of our students, I am uncomfortable with having altar call as part of our weekly chapel.
And I thanked him for the suggestion, all his hard work, etc. He has not responded. He is really good at his job and he is a great guy. I hope he understands. I respect him and I don't want a theological showdown, ya know?