7 facts about U.S. Catholics - Pew Research Center:

The Catholic Church is larger than any other single religious institution in the United States, with over 17,000 parishes that serve a large and diverse population. In spite of its size and influence, the church in recent decades has faced a number of significant challenges, from a decline in membership to a shortage of priests to continuing revelations that some Catholic clergy sexually abused minors and (in many cases) that their superiors covered up these actions. ....
http://www.pewresearch.org/fact-tank/2018/10/10/7-facts-about-american-catholics/