That’s the takeaway from the latest Pew survey of American religion, released with great fanfare this week. The percentage of Americans who describe themselves as Christians has dropped sharply, by nearly eight percent since the last analogous Pew survey, in 2007. Most of the decline comes from mainline Protestant denominations and the Catholic Church. The percentage of Americans who call themselves Evangelicals has stayed roughly the same.

A corresponding increase has occurred in the number of Americans who say they are religiously unaffiliated—the so-called “Nones.” In the 2007 survey, roughly 16 percent of Americans described themselves as unaffiliated. Now it’s about 23 percent, a seven percent rise. When one looks at younger Americans, the numbers are even more stark. More than one-third of Millennials say they are religiously unaffiliated. The younger Americans are, the more they have checked out of religious institutions.

Some argue that surveys like Pew’s overstate the percentage of American Nones, and I’m curious what sociologists will say about these numbers. But the trend is clear, at least for the moment. A significant and growing percentage of Americans are detaching from organized religion, especially from the historically important mainline churches. A minority of American Nones—a growing number, according to Pew—describe themselves as atheists or agnostics. But the majority of Nones do not have problems with belief as such. They reject, or are at least indifferent to, the claims of organized religion. They are the so-called “spiritual but not religious,” or, perhaps “religious indifferents.”

Afew quick observations. First, it seems unlikely that these new Nones have had sudden, reverse-Damascus Road experiences in the last several years. I suspect many of the new Nones already had weak commitments to their religious institutions—or, in the case of Millennials, commitments that never really formed—and now have dropped out completely. Church membership confers less social status than it used to do—in some settings, it confers negative social status—and the marginal probably feel more comfortable cutting their ties completely. So the decline in genuine religious attachment is probably not as precipitous as the Pew numbers would suggest.

Second, one often hears that Christianity’s identification with conservatism explains the Nones. People, especially the Millennials, don’t care for conservatism, and so avoid conservative Christian churches. But it’s precisely the liberal churches that have experienced the greatest decline in the last several years. Plus, George W. Bush has been out of office for six years, during which time we have had a president who touts his liberal Christianity on many occasions. If it were just about politics, you would expect the liberal Christian churches to be gaining ground. But they’re falling further behind. Perhaps the association with conservatism is so profound and odious that people don’t want to be affiliated even with liberal Christian churches. Whatever the explanation, the political dynamic seems to be complicated.

Finally, it’s hard to see how the rise of the Nones is good for religious freedom. As people check out of organized religion, they are less likely to view it as important and worthy of protection. People with even marginal affiliations may still understand and endorse the importance of religious commitment. The fact that they affiliate at all shows that religion makes up at least some part of their identity. Once people cut their ties completely, however, they are much less likely to be sympathetic to religious communities. If the future of religious freedom depends on the ability of believers to persuade our fellow citizens that faith commitments deserve respect and protection, that task may well become more difficult in the years ahead.

Mark Movsesian is the Frederick A. Whitney Professor of Contract Law and the Director of the Center for Law and Religion at St. John’s University School of Law. His previous blog posts can be found here.