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. Killings in the U.S. are even more rare.
But an attack on Monday targeting a mosque in San Diego — the latest in a spate of recent attacks targeting religious buildings — has intensified fear among clergy and worshippers.
