The Catholic Church’s cover-up of pedophile priests, which led to more sexual abuse of children, has taken a toll on membership. Muslims are clearly in the lead worldwide.
Worldwide, the Roman Catholic Church now has 1.1 billion members, compared with 1.5 billion Muslims and 593 million Protestants. In the U.S., all the major denominations have seen their numbers decline in recent years, but the Catholic Church has taken the biggest hit. Since the 1960s, four American-born Catholics have left the church for every one who has converted, according to a 2009 Pew study. In 2008 alone, Catholic membership declined by 400,000. More than 1,000 parishes have closed since 1995, and the number of priests has fallen from about 49,000 to 40,000 during that same period. Some 3,400 Catholic parishes in the U.S. now lack a resident priest.
The situation [in Europe] is even more dire, especially in the most historically devout countries. In 1991, 84 percent of the Irish population attended Mass at least once a week. Today the weekly attendance figure is less than 50 percent. In Spain, 81 percent of the population identifies itself as Catholic, but two-thirds say they seldom or never attend services. And the priest shortage is acute—in England and Wales, the church ordained only 16 clergy members in all of 2009.


