We especially need this training in the post-Christian culture our children will inherit. As Christians we find ourselves living among neighbors who show less interest in our faith than ever before. Between 2007 and 2014, the number of Americans claiming no religious affiliation jumped from 16 percent to 23 percent. In the UK, recent statistics show the religiously unaffiliated have grown to more than half the population. In the rest of Europe, the statistics are worse, not better.

Not surprisingly, this secularization leads to deep chasms of distrust between Christians and non-Christians, some of whom openly distain biblical Christianity. On Twitter, a Christian author remarked that she was rejected by multiple publishing houses when they learned she was Christian. On university campuses, Christian groups have been denied access to college facilities because they affirm biblical sexual values. Many non-Christians say they believe Christians (particularly evangelicals) are bigoted, intolerant, greedy, anti-intellectual, anti-science killjoys.