The Nones: Where They Came From, Who They Are, and Where They Are Going by Ryan P. Burge
People with no religious belief have been growing significantly since the 1990s. Why is this so and who are they? The author dives into social survey data to come up with a number of explanations. There are a few different surveys that look at a group of people at a point in time. They don't look at the same people, so it is difficult to find individual changes. The surveys also have different buckets. (The oldest one has a smaller sample size and just "Protestant, Christian, Other and None". Newer ones have larger sample sizes and more options, but don't go back in time as far.)
The United States has been an anomaly. Typically, countries have become less religious as they have become wealthier. The US is very wealthy and religious at the same time. Could part of this be a reversion to the mean? What could be driving it? Some people may simply feel more comfortable reporting no church affiliation. In the past, they may have felt the need to report a religious affiliation, even if they never attended church.
Different churches are being impacted in different ways. Mainline protestants see most of the fall. "Other" religious, such as Church of Jesus Christ of Latter-day Saints and Muslims see growth. Jews continue to be a social group even if they do not actively practice. The religious right may have galvanized some believers while turning off others. While the religious tended to be politically balanced before, they are now overwhelmingly right wing. Scandals such as that in the catholic church may have also hurt.
Demographics also play a role. Youth and parents tend to have high church attendance, while young adults have lower church attendance. Today people are marrying and having kids later in life. They are is in more non-traditional relationships. Family sizes are also smaller and people are moving further from families.
The internet and communications may also play a role. People would often adhere to their local community standards, even if they didn't share the beliefs. Today, it is easy to find an online community with the most obscure beliefs. Black churches were also the hub for black social and political activity. Now that can also be had elsewhere.
All "nones" are also not created equal. In a survey that distinguishes between atheists, agnostics and "no religion", there are significant differences in the three groups. The "no religion" are more likely to attend church and to later claim a religious affiliation.