I am not sure if this article reporting on an interfaith dialogue represents sloppy reporting on the Christian theologian, or sloppy thinking on his part. Whichever the case, between his comments and those of the Muslim leader what is obvious is that Christianity and Islam in their traditional and historic forms are mutually incompatible. Moreover, they are necessarily competitors because they each make universal claims that are mutually exclusive. Each claims a revelation that supercedes all others.