From his website:Mark is of Jewish descent, but was baptized a Catholic, confirmed an Anglican, and currently attends a small rural American Baptist Church. As John Podhoretz of The New York Post said, “You’re not Jewish or gay? But you wrote a book on musicals?”
It really doesn't matter what he has been baptized or where he attends church. In non=Jewish eyes he will always be Jewish. His place in the cattle car is already reserved.