Factors Behind the Changes in Americans’ Religious Identification
One of the most important factors in the declining share of Christians and the growth of the “nones” is generational replacement. As the Millennial generation enters adulthood, its members display much lower levels of religious affiliation, including less connection with Christian churches, than older generations. Fully 36% of young Millennials (those between the ages of 18 and 24) are religiously unaffiliated, as are 34% of older Millennials (ages 25-33). And fewer than six-in-ten Millennials identify with any branch of Christianity, compared with seven-in-ten or more among older generations, including Baby Boomers and Gen-Xers. Just 16% of Millennials are Catholic, and only 11% identify with mainline Protestantism. Roughly one-in-five are evangelical Protestants.
However, generational replacement is by no means the only reason that religious "nones" are growing and Christians are declining. In addition, people in older generations are increasingly disavowing association with organized religion. About a third of older Millennials (adults currently in their late 20s and early 30s) now say they have no religion, up nine percentage points among this cohort since 2007, when the same group was between ages 18 and 26. Nearly a quarter of Generation Xers now say they have no particular religion or describe themselves as atheists or agnostics, up four points in seven years. Baby Boomers also have become slightly but noticeably more likely to identify as religious “nones” in recent years.
As the shifting religious profiles of these generational cohorts suggest, switching religion is a common occurrence in the United States. If all Protestants were treated as a single religious group, then fully 34% of American adults currently have a religious identity different from the one in which they were raised. This is up six points since 2007, when 28% of adults identified with a religion different from their childhood faith. If switching among the three Protestant traditions (e.g., from mainline Protestantism to the evangelical tradition, or from evangelicalism to a historically black Protestant denomination) is added to the total, then the share of Americans who currently have a different religion than they did in childhood rises to 42%.
By a wide margin, religious "nones" have experienced larger gains through religious switching than any other group. Nearly one-in-five U.S. adults (18%) were raised in a religious faith and now identify with no religion. Some switching also has occurred in the other direction: 9% of American adults say they were raised with no religious affiliation, and almost half of them (4.3% of all U.S. adults) now identify with some religion. But for every person who has joined a religion after having been raised unaffiliated, there are more than four people who have become religious "nones" after having been raised in some religion. This 1:4 ratio is an important factor in the growth of the unaffiliated population.
By contrast, Christianity – and especially Catholicism – has been losing more adherents through religious switching than it has been gaining. More than 85% of American adults were raised Christian, but nearly a quarter of those who were raised Christian no longer identify with Christianity. Former Christians represent 19.2% of US adults overall.
Both the mainline and historically black Protestant traditions have lost more members than they have gained through religious switching, but within Christianity the greatest net losses, by far, have been experienced by Catholics. Nearly one-third of American adults (31.7%) say they were raised Catholic. Among that group, fully 41% no longer identify with Catholicism. This means that 12.9% of American adults are former Catholics, while just 2% of US adults have converted to Catholicism from another religious tradition. No other religious group in the survey has such a lopsided ratio of losses to gains.
The evangelical Protestant tradition is the only major Christian group in the survey that has gained more members than it has lost through religious switching. Roughly 10% of US adults now identify with evangelical Protestantism after having been raised in another tradition, which more than offsets the roughly 8% of adults who were raised as evangelicals but have left for another religious tradition or who no longer identify with any organized faith.
Other highlights in this report include:
- The Christian share of the population is declining and the religiously unaffiliated share is growing in all four major geographic regions of the country. Religious “nones” now constitute 19% of the adult population in the South (up from 13% in 2007), 22% of the population in the Midwest (up from 16%), 25% of the population in the Northeast (up from 16%) and 28% of the population in the West (up from 21%). In the West, the religiously unaffiliated are more numerous than Catholics (23%), evangelicals (22%) and every other religious group.
- Whites continue to be more likely than both blacks and Hispanics to identify as religiously unaffiliated; 24% of whites say they have no religion, compared with 20% of Hispanics and 18% of blacks. But the religiously unaffiliated have grown (and Christians have declined) as a share of the population within all three of these racial and ethnic groups.
- The percentage of college graduates who identify with Christianity has declined by nine percentage points since 2007 (from 73% to 64%). The Christian share of the population has declined by a similar amount among those with less than a college education (from 81% to 73%). Religious “nones” now constitute 24% of all college graduates (up from 17%) and 22% of those with less than a college degree (up from 16%).
- More than a quarter of men (27%) now describe themselves as religiously unaffiliated, up from 20% in 2007. Fewer women are religious “nones,” but the religiously unaffiliated are growing among women at about the same rate as among men. Nearly one-in-five women (19%) now describe themselves as religiously unaffiliated, up from 13% in 2007.
- Although it is low relative to other religious groups, the retention rate of the unaffiliated has increased. In the current survey, 53% of those raised as religiously unaffiliated still identify as "nones" in adulthood, up seven points since 2007. And among Millennials, "nones" actually have one of the highest retention rates of all the religious categories that are large enough to analyze in the survey.
- As the ranks of the religiously unaffiliated continue to grow, they also describe themselves in increasingly secular terms. In 2007, 25% of the "nones" called themselves atheists or agnostics; 39% identified their religion as "nothing in particular" and also said that religion is "not too" or "not at all" important in their lives; and 36% identified their religion as “nothing in particular” while nevertheless saying that religion is either "very important" or "somewhat important" in their lives. The new survey finds that the atheist and agnostic share of the "nones" has grown to 31%. Those identifying as "nothing in particular" and describing religion as unimportant in their lives continue to account for 39% of all "nones." But the share identifying as "nothing in particular" while also affirming that religion is either "very" or "somewhat" important to them has fallen to 30% of all "nones."
- While the mainline Protestant share of the population is significantly smaller today than it was in 2007, the evangelical Protestant share of the population has remained comparatively stable (ticking downward slightly from 26.3% to 25.4% of the population). As a result, evangelicals now constitute a clear majority (55%) of all U.S. Protestants. In 2007, roughly half of Protestants (51%) identified with evangelical churches.
- Since 2007, the share of evangelical Protestants who identify with Baptist denominations has shrunk from 41% to 36%. Meanwhile, the share of evangelicals identifying with nondenominational churches has grown from 13% to 19%.
- The United Methodist Church (UMC) continues to be the largest denomination within the mainline Protestant tradition. Currently, 25% of mainline Protestants identify with the UMC, down slightly from 28% in 2007.
- More than six-in-ten people in the historically black Protestant tradition identify with Baptist denominations, including 22% who identify with the National Baptist Convention, the largest denomination within the historically black Protestant tradition.
- The share of the public identifying with religions other than Christianity has grown from 4.7% in 2007 to 5.9% in 2014. Gains were most pronounced among Muslims (who accounted for 0.4% of respondents in the 2007 Religious Landscape Study and 0.9% in 2014) and Hindus (0.4% in 2007 vs. 0.7% in 2014).12
- Roughly one-in-seven participants in the new survey (15%) were born outside the U.S., and two-thirds of those immigrants are Christians, including 39% who are Catholic. More than one-in-ten immigrants identify with a non-Christian faith, such as Islam or Hinduism.
- Hindus and Jews continue to be the most highly educated religious traditions. Fully 77% of Hindus are college graduates, as are 59% of Jews (compared with 27% of all U.S. adults). These groups also have above-average household incomes. Fully 44% of Jews and 36% of Hindus say their annual family income exceeds $100,000, compared with 19% of the public overall.
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