NEW YORK  —For the first time in its history, the United States does not have a Protestant majority, according to a new study. One reason: The number of Americans with no religious affiliation is on the rise.

The percentage of Protestant adults in the U.S. has reached a low of 48 percent, the first time that Pew Forum on Religion & Public Life has reported with certainty that the number has fallen below 50 percent.

The drop has long been anticipated and comes at a time when no Protestants are on the U.S. Supreme Court and Republicans have their first presidential ticket with no Protestant nominees.

Among the reasons for the change are the growth in nondenominational Christians who can no longer be categorized as Protestant, and a spike in the number of American adults who say they have no religion. The Pew study, released Tuesday, found that about 20 percent of Americans say they have no religious affiliation, an increase from 15 percent in the last five years.

Scholars have long debated whether people who say they no longer belong to a religious group should be considered secular. While the category as defined by Pew researchers includes atheists, it also encompasses majorities of people who say they believe in God, and a notable minority who pray daily or consider themselves "spiritual" but not "religious."


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Still, Pew found overall that most of the unaffiliated aren't actively seeking another religious home, indicating that their ties with organized religion are permanently broken.

Growth among those with no religion has been a major preoccupation of American faith leaders who worry that the United States, a highly religious country, would go the way of Western Europe, where church attendance has plummeted in many countries.

The trend also has political implications. American voters who describe themselves as having no religion tend to vote overwhelmingly for Democrats. Pew found Americans with no religion support abortion rights and gay marriage at a much higher-rate than the U.S. public at large. These "nones" are an increasing segment of voters who are registered as Democrats or lean toward the party, growing from 17 percent to 24 percent over the Past five years.

The Pew analysis, conducted with PBS' "Religion & Ethics Newsweekly," is based on several surveys, including a poll of nearly 3,000 adults conducted June 28-July 9.