The percentage of Americans who follow no religion has doubled since 1990, according to a new survey of religious identity. At 15 percent, they are now the third largest group, behind Catholics and Baptists. The Christian majority has dwindled by 10 points in the last 18 years.

While only 1.6 million people identify as atheist or agnostic, 12 percent believe there is no God or are unsure whether there’s a God and another 12 percent believe in an impersonal higher power.

Read other key findings here.

ABC News:

The percentage of Americans who follow no religion has doubled since 1990, according to a new survey of religious identity. At 15 percent, they are now the third largest religious constituency, behind Catholics and Baptists. The Christian majority has dwindled by 10 points in the last 18 years.

While only 1.6 million people identify as atheist or agnostic, 12 percent believe there is no God or are unsure whether there’s a God and another 12 percent believe in a impersonal higher power.

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