IF THE "Arab Spring" bathed the Middle East in some much-needed sunlight, there's at least one group that sees ominous clouds on the not-so-distant horizon. That would be the region's embattled and apprehensive Christians, who've lived a kind of double life for many decades. While nominally citizens of the countries they inhabit, most non-Muslims, the majority of whom are Christian, are treated as second-class members of society because so many governments in that part of the world adhere to sharia, and anyone familiar with the Islamic legal system knows that it codifies discrimination. For example, while Christians are free (and...