A new survey released Wednesday, which looks at religious traditions in the largest metropolitan areas of the U.S., found that "unaffiliated" the second largest religious practice in Philadelphia.

Catholics make up more than a quarter of the Philly metro area, but non-identifiers trail closely at 20 percent, followed then by Black Protestantism.

The survey was conducted by the Public Religion Research Institute (PRRI) didn't specify its research methods. Earlier in the year, the same organization looked at the top three religious traditions in the U.S. The new research uses data from the American Values Atlas (AVA) to find local and national trends. Here are the key findings:

• Catholicism is the top religious group—or tied for the top religious group—in 15 of the major metro areas.
• The religiously unaffiliated is the top “religious” group—or tied for the top religious group—in 10 of the major metro areas.
• And don’t forget about white evangelical Protestants, who take the top prize in six of the major metro areas.
• Atlanta is the only metro area that doesn’t have Catholics, the religiously unaffiliated, or white evangelical Protestants in the number one slot; that prize goes to black Protestants.