2015 Sees Sharp Rise in Post-Christian Population


Infographics in Cities & States • August 12, 2015

While the United States remains shaped by Christianity, the faith’s influence—particularly as a force in American politics and culture—is slowly waning. An increasing number of religiously unaffiliated, a steady drop in church attendance, the recent Supreme Court decision on same-sex marriage, and the growing tension over religious freedoms all point to a larger secularizing trend sweeping across the nation.

But how do the numbers stack up? Is America, home to the largest Christian population in the world, actually becoming a “post-Christian” nation? In a recent study, Barna Group analyzed 60,808 interviews conducted over a seven-year period to measure irreligion in American cities. Currently, 78% of Americans describe themselves as “Christian,” but in order to dig deeper than just self-affiliation, Barna Group looked at a variety of key faith indicators for both belief and practice.

To measure a person’s level of irreligion, Barna Group tracks 15 metrics related to faith (you can find the full list of 15 at the end of the article). These factors speak to the lack of Christian identity, belief and practice. These factors include whether individuals identify as atheist, have never made a commitment to Jesus, have not attended church in the last year, or have not read the Bible in the last week.

These kinds of questions—compared to ticking the “Christian” box in a census—get beyond how people loosely identify themselves (affiliation), and get to the core of what people actually believe and how they behave as a result of their belief (practice). These indicators give a much more accurate picture of belief in America.

To qualify as “post-Christian,” individuals had to meet 60% or more of the factors (nine or more out of 15 criteria). “Highly post-Christian” individuals meet 80% or more of the factors (12 or more of these 15 criteria). Read more about Barna’s post-Christian metric.

Where Are We as a Nation?
Whether one believes this decline of “Christian America” calls for a time of lament, or presents great opportunity (or both) for the church, one cannot help but accept the changing landscape. In just two years, the percentage of Americans who qualify as “post-Christian” rose by 7 percentage points, from 37% in 2013 to 44% in 2015. Across the United States, cities in every state are becoming more post-Christian—some at a faster rate than others

Find out which American cities ranked as the most “Post-Christian” in 2015—
and see where you city stands >

Post-Christian Metrics
To qualify as “post-Christian,” individuals had to meet 60% or more of the following factors (nine or more). “Highly post-Christian” individuals meet 80% or more of the factors (12 or more of these 15 criteria).

  1. Do not believe in God
  2. Identify as atheist or agnostic
  3. Disagree that faith is important in their lives
  4. Have not prayed to God (in the last year)
  5. Have never made a commitment to Jesus
  6. Disagree the Bible is accurate
  7. Have not donated money to a church (in the last year)
  8. Have not attended a Christian church (in the last year)
  9. Agree that Jesus committed sins
  10. Do not feel a responsibility to “share their faith”
  11. Have not read the Bible (in the last week)
  12. Have not volunteered at church (in the last week)
  13. Have not attended Sunday school (in the last week)
  14. Have not attended religious small group (in the last week)
  15. Do not participate in a house church (in the last year)

About the Research
The data reported in this article are based on telephone and online interviews with nationwide random samples of 60,808 adults conducted over a seven-year period, through 2015.

The maximum margin of sampling error associated with the aggregate sample is plus or minus 0.4 percentage points at the 95% confidence level. All non-institutionalized adults in the 48 contiguous states were eligible to be interviewed and the distribution of respondents in the survey sample corresponds to the geographic dispersion of the U.S. adult population. Some interviews were conducted in Spanish, but the vast majority of the interviews were completed in English.

All telephone interviews were conducted by Barna Group. All households were selected for inclusion in the sample using a random-digit dial technique, which allows every telephone household in the nation to have an equal and known probability of selection. Households selected for inclusion in the survey sample received multiple callbacks to increase the probability of obtaining a representative distribution of adults. Regional quotas were used to ensure that sufficient population dispersion was achieved. There were also minimum and maximum ranges placed on the distribution of respondents within several demographic variables that were tracked during the field process to ensure that statistical weighting would not be excessive. When a particular attribute reached one of the parameters, the sampling selection process was varied to preclude individuals who did not meet the necessary demographic criterion, with the interviewer seeking a person from the same household who fit the desired criterion. Up to 30% of telephone interviewing was conducted on cell phones in the data represented in States.

Online interviews were conducted using an online research panel called KnowledgePanel® based on probability sampling that covers both the online and offline populations in the U.S. The panel members are randomly recruited by telephone and by self-administered mail and web surveys. Households are provided with access to the Internet and hardware if needed. Unlike other Internet research that covers only individuals with Internet access who volunteer for research, this process uses a dual sampling frame that includes both listed and unlisted phone numbers, telephone and non-telephone households, and cell-phone-only households. The panel is not limited to current Web users or computer owners. All potential panelists are randomly selected to join the KnowledgePanel; unselected volunteers are not able to join.

The survey questions pertaining to faith and demographics were analyzed in reference to two different geographic perspectives: by DMA and by state. The label “DMA” stands for Designated Market Area and represents a unique geographic area that also serves as a commonly accepted media market as defined by The Neilsen Company. DMAs have been configured so that the entire U.S. is assigned to one, and only one, of 210 DMAs. These are based on the television viewing habits of the residents in each county.

While there are 210 DMAs, this report contains data for 117. These are the areas in which Barna had a sufficient number of completed surveys with people from a given market. In most markets, we had a sample of 150 or more; a few smaller markets had a minimum of 100. We used the same minimum-level criteria for the states analyzed in this report.

Some calculations include data from The Nielsen Company/Local Television Market Universe Estimates and the U.S. Census Bureau.

© 2015, Barna Group


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