By Daniel Burke, CNN Belief Blog Co-editor

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(CNN) - The number of nonreligious Jews is rising in the United States, with more than one in five saying they are not affiliated with any faith, according to a new survey.

While similar trends affect almost every American religion, Jewish leaders say the new survey spotlights several unique obstacles for the future of their faith.

According to the survey, conducted by Pew Research Center's Religion & Public Life Project, non-religious Jews are less likely to care deeply about Israel, donate to Jewish charities, marry Jewish spouses and join Jewish organizations.

Pew says their study sought to explore the question, "What does being Jewish in America mean today?" The answer is quite complicated.

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