"The real issue relating to exclusiveness is whether the Christian actually has a relationship with God, a presence of God, that non-Christians do not have. Apart from Christian spiritual formation as described here, I believe there is little value in claiming exclusiveness for the Christian way.

The realization of this may be what is reflected in the current mass abandonment of the exclusiveness of Christianity that is going on among Western Christians now, especially in its academic centers. Why should one insist on the exclusiveness of Christianity if all it is is one more cultural form? But let the reality of the Christian spiritual formation come to its fullness, and exclusiveness will take care of itself. If the witch and the warlock, the Buddhist and the Muslim, can truly walk in holiness and power equal to that of Jesus Christ and his devoted followers, there is nothing more to say. But Christ himself, and not Christianity as a form of human culture, is the standard by which "we" as well as "they" are to be measured. (Acts 17:31)"

Dallas Willard, "The Great Omission"