lifestyle. Such Jews are called baalei teshuva ("returners", see also Repentance in Judaism). The 2008 American Religious Identification Survey found that around 3.4 million American Jews call themselves religious—out of a general Jewish population of about 5.4 million. The number of Jews who identify themselves as only culturally Jewish has risen from 20% in 1990 to 37% in 2008, according to the study. In the same period, the number of all US adults who said they had no religion rose from 8% to 15%. Jews are more likely to be secular than Americans in general, the researchers said. About half of all US Jews—including those who consider themselves religiously observant—claim in the survey that they have a secular worldview and see no contradiction between that outlook and their faith, according to the study's authors. Researchers attribute the trends among American Jews to the high rate of intermarriage and "disaffection from Judaism" in the United States. Religious beliefs American Jews are more likely to be atheists or agnostics than most Americans, especially when they are compared with American Protestants or Catholics. A 2003 poll found that while 79% of Americans believe in God, only 48% of American Jews do, compared to 79% and 90% of American Catholics and Protestants respectively. While 66% of Americans said that they were "absolutely certain" of God's existence, 24% of American Jews said the same. And though 9% of Americans believe that there is no God (8% of American Catholics and 4% of American Protestants), 19% of American Jews believe that God does not exist. A 2009 Harris Poll showed that American Jews constitute the one religious group which is most accepting of the science of evolution, with 80% accepting evolution, compared to 51% for Catholics, 32% for Protestants, and 16% of born-again Christians. They were also less likely to believe in supernatural phenomena such as miracles, angels, or heaven. A 2013 Pew Research Center report found that 1.7 million American Jewish adults, 1.6 million of whom were raised in Jewish homes or had Jewish ancestry, identified as Christians or Messianic Jews but also consider themselves ethnically Jewish. Another 700,000 American Christian adults considered themselves "Jews by affinity" or "grafted-in" Jews. Buddhism Jews are overrepresented among American Buddhists; this is specifically the case among those Jews whose parents are not Buddhist, and those Jews who are without a Buddhist heritage, with between one fifth and 30%