Interfaith marriage in Judaism (also called mixed marriage or intermarriage) was historically looked upon with very strong disfavour by Jewish leaders, and it remains a controversial issue amongst them today. In the Talmud, interfaith marriage is completely prohibited, although the definition of interfaith is not so simply expressed. A 2013 survey conducted in the United States by the Pew Research Center’s Religion & Public Life Project found that intermarriage rate to be 58% among all Jews and 71% among non-Orthodox Jews.