In 2023, 27.5 percent of Americans were unaffiliated with any religion. A further 13.4 percent of Americans were White evangelical Protestants, and an additional 13.3 percent were White mainline Protestants. Religious trends in the United States Although the United States is still home to the largest number of Christians worldwide, the nation has started to reflect a more diverse religious landscape in recent years. Americans now report a wide range of religious beliefs and backgrounds, in addition to an increasing number of people who are choosing to identify with no religion at all. Studies suggest that many Americans have left their previous religion to instead identify as atheist, agnostic, or nothing in particular, with many reasoning that they stopped believing in the religion's teachings, that they didn't approve of negative teachings or treatment of LGBTQ+ people, or that their family was never that religious growing up. Christian controversies Over the last few years, controversies linked to Christian denominations have plagued the nation, including reports of child sexual abuse by the Catholic Church, the Church of Jesus Christ of Latter-day Saints, and the Southern Baptist Convention. Christian churches have also been accused of supporting discriminatory actions against LGBTQ+ people and people belonging to other religious groups. In addition, there have been increasing concerns about Christian nationalism, the political ideology that asserts that America was founded to be a Christian nation. Although the majority of Americans still think that declaring the United States a Christian nation would go against the U.S. Constitution, studies found that most Republicans would be in favor of this change.

The statistic shows the religious affiliation of the population in the United States in 2017, by age. In 2017, about 38 percent of respondents aged 18 to 29 years old were unaffiliated with any religious belief.

This graph shows the ratio of religious adherents to population in the United States in 2010, by state. In 2010, about 79 percent of Utah's population were adherents to a religion.

This statistic shows the share of adults in the United States affiliated to a religious denomination in January 2017, by race/ethnicity. As of January 2017, 15 percent of Asian or Pacific Islanders in the United States identified themselves as Hindu.

In 2023, about 33 percent of Americans were Protestants, down from 69 percent in 1948. In that same year, about 22 percent of Americans were Catholic, while 22 percent said that they had no religion at all.

As of 2020, the majority of immigrants living in the United States were Christians, with Christians making up 70 percent of the U.S. migrant population. A further 13 percent of U.S. migrants identified as religiously unaffiliated in that year, while seven percent identified as Muslims.

This statistic shows the results of a survey among Americans on their religiosity in 2017, by state. In Mississippi, about 59 percent of respondents stated they were "very religious", 29 percent defined themselves as "moderately religious" and 12 percent said they were "nonreligious".

In 1972, an estimated 90 percent of the population in the United States identified as Christian. By 2020, this number dropped down to 64 percent, a phenomenon which may be attributed to recent trends where many Americans have left Christianity to instead identify as atheist, agnostic, or nothing in particular. If these trends continue, the number of Americans who are Christian has been projected to fall to 35 percent by 2070.

From 2010 to 2023, Democrats were found much more likely than Republicans to identify with no religion in the United States. In 2023, 33 percent of Democrats said that they identified with no religion compared to 12 percent of Republicans.

According to a survey conducted in 2020, 54 percent of Indian Americans in the United States said that they identified as Hindu while 13 percent said that they identified as Muslim. A further nine percent said that they identified with no religion in particular.

This statistic shows the percentage of church income by individual donations in the United States in 2008, by faith tradition. As of 2008, individual donations make up for about 97 percent of income of Conservative Protestant churches in the United States.

The statistic shows the religious affiliation of the population in the United States in 2007. In 2007, 51.3 percent of the U.S. population were estimated to be Protestants.

According to a survey conducted from 2022 to 2023, 34 percent of Asian Americans identified as Christian in the United States while 32 percent identified with no religion. In comparison, 11 percent of Asian Americans also identified as either Buddhist or Hindu.

According to a survey conducted in 2022, 44 percent of Jewish Americans said that they made 100,000 U.S. dollars or more in the United States. In comparison, 33 percent of Muslim Americans said that they made less than 30,000 U.S. dollars.

This statistic shows the gender distribution of religious groups in the United States, as of January 2017, by faith tradition. In January 2017, about 48 percent of Jews in the United States were men.

This statistic shows U.S. prison chaplains estimations of the percentage of inmates belonging to different organized faiths and religions as of 2011. Chaplains surveyed reported that on average 50.6 percent of inmates were of protestant faiths.

Additional information on religion in United States prisons

The religious affiliation of inmates in the United States, the country with most prisoners per head globally, is reasonably similar to the religious affiliations of the society overall. That said, the proportion of non-religious inmates and those declining to express their religious affiliation is smaller than the overall proportion. In contrast the number of Muslim inmates is disproportionately large in comparison with wider society. As a result a sizable share of prison chaplains identity as Muslim, catering to the preferences of the Muslim prison population.

Following the September 11, 2001 World Trade Centre attacks and the subsequent War on Terror launched by George W. Bush, religious extremism has been a target of public debate and policy. The debate has stretched into prisons particularly with the United States prison on Guantanamo Bay holding a number of suspected terrorists related to religious extremism. In turn, fears have been raised that prisons have become a hotbed for religious extremism.

Critics have argued that religious extremism has provided an unwarranted justification for the conviction of Muslims. Regardless of the supposed reason for their imprisonment, this disproportionate number presents a problem for United States policy makers.

From 2021 to 2023, Republicans were found much more likely than Democrats to be Protestants in the United States, with 56 percent of surveyed Republicans identifying as Protestants compared to 38 percent of Democrats. However, Democrats were found more likely than Republicans to identify with no religion, with 26 percent of Democrats saying that they have no religious identity compared to 11 percent of Republicans.

The U.S. Congress has become increasingly diverse over the years, though remains predominantly Protestant and Catholic. In 2023, 56.7 percent of Congress identified as Protestant, and 0.6 percent of Congress identified as Muslim.

According to a survey conducted in 2023, 74 percent of all U.S. adults said that they believed in God while 25 percent of Americans who identified with no religion shared this belief. In comparison, 94 percent of Americans who were Protestant or other Christian and 85 percent of Americans who were Catholic also said that they believed in God in that year.

This statistic shows the distribution of political party affiliations among religious groups in the United States, in 2016, by faith tradition. In 2016, about 44 percent of Mormon in the United States affiliated themselves with the Republican Party.