Statistically, attending a weekly worship service is a remarkably safe thing to do. Global annual attendance totals many billions; the number of people killed in attacks on individual houses of worship in any given year is generally less than a few hundred. Yet recent high-profile deadly attacks have intensified anxiety and outright fear among clergy and worshippers worldwide. Just in the past six weeks there have been attacks on a synagogue in Manchester, England; a Michigan congregation of The Church of Jesus Christ of Latter-day Saints; and a Catholic church in the United States hosting a Mass for school children.