what percent of the u.s. population is estimated to hold membership in a religious organization
The majority of U.S. adults self-identify as Christians, while around 20-25% claim no religious affiliation. According to a 2017 study by the Public Religion Research Institute, approximately 69% of the Americans identified themselves as Christians, with 45% professing attendance at a variety of churches that could be considered Protestant, and 20% professing Catholic beliefs. The same study says that other non-Christian religions (including Judaism, Buddhism, Hinduism, and Islam) collectively make up about 7% of the population. According to a 2016 Gallup poll, Mississippi (with 63% of its adult population described as very religious, saying that religion is important to them and attending religious services almost every week) is the most religious state in the country, while New Hampshire (with only 20% of its adult population described as very religious) is the least religious state. The same company found in 2016 that 73.7% of Americans is Christian, comprising a 48.9% of Protestants, a 23.0% of Catholics and 1.8% of Mormons; the 18.2% had no religion and the 5.4% was affiliated with another religion.