Persecuted Christians are fleeing from the Middle East in increasing numbers. The United States should open its doors to them as a guaranteed safe haven.-SNIP-The Christian population in Iraq is one of the most at risk. Around half of Iraqi Christians have fled the country since 2003, and those who remain expect growing challenges, given the U.S. military pullout. Christians have suffered periodic waves of violence, including bombings, assassinations and church burnings. When Iraq's government said in 2010 it would issue a license to carry firearms to any Christian family that wanted one, it was simply acknowledging the reality that...