Whenever people today say that Christianity needs to update and adapt its moral standards for the 21st century, I hear echoes from 100 years ago. Back then, the calls for change had less to do with morality and more to do with miracles. But the motivation was similar, and the results are instructive. What rocked the early 20th century was the call of many church leaders to adapt the Christian faith to the scientific age of discovery. One could not expect thinking men and women to accept at face value all the miracles in the Bible, the thinking went. The...