72% of the members of the National Academy of Sciences are atheists and 21% are agnostic According to the leading science journal Nature 394:313, a recent survey of members of the National Academy of Sciences showed that 72% are outright atheists, 21% are agnostic and only 7% admit to belief in a personal God.  This survey and many more showing that more intelligent people tend not to believe in religion. Objectivethought.com - stats   Gallup Organization 1991 poll tabulates 5% of scientists believe in biblical creationism Religious Tolerance.org   80% of U.S. prisoners are Christian and 0.2% are atheists Data source is The Federal Bureau of Prisons, March 1997. Holysmoke.org - prisons   The World Christian Encyclopedia tabulates 10,000 distinct religious groups, including 33,830 Christian denominations Adherents.com - WCE   Among Wealthy Nations, the U.S. Stands Alone in its Embrace of Religion Religion is much more important to Americans than to people living in other wealthy nations. Six-in-ten (59%) people in the U.S. say religion plays a very important role in their lives. This is roughly twice the percentage of self-avowed religious people in Canada (30%), and an even higher proportion when compared with Japan and Western Europe. Americans' views are closer to people in developing nations than to the publics of developed nations. Pew Research Center Report 167   Secular/Nonreligious/Agnostic/Atheist is the world's third largest "religion" at 1.1 billion Major Religions of the World Ranked by Number of Adherents is available at: Adherents.com - Religions by Adherents   In 10 years the percentage of the U.S. population with no religious affiliation has doubled to 14% In the past 10 years the percentage of the U.S. population with no religious affiliation has doubled to 14%.  See table 2 in The Vanishing Protestant Majority at: University of Chicago PROTSGO8.pdf   The American Religious Identification Survey also tabulates the percentage of the U.S. population with no religious affiliation at 14%. ARIS – Key Findings   The Institute for Jewish & Community Research in their Heritage and Religious Identification (HARI) survey tabulates the percentage of the U.S. population with no religious affiliation at 16%. The Decline of Religious Identity in the United States