[T]he New Testament itself, the very cradle of Christianity, reflects in a startling way the fact that the faith of Jesus Christ was built and nourished upon the controversy which it provoked.

It was said of the early Christians that they “turned the world upside down” (Acts 17:6); indeed the message of the Cross itself is offensive and controversial by nature.

Robert Ingersoll, the late great agnostic and renowned antagonist of Christianity, was wise enough to recognize this fact and stated in his famous lectures:

If this religion is true, then there is only one Savior, only one narrow path to life. Christianity cannot live in peace with any other religion. ((Walter Martin, The Kingdom of the Cults, Ravi Zacharias, Gen. Ed. [Minneapolis: Bethany House, 2005], 473.))

Walter Martin

Further reading