Young Earth creationism (YEC) is the religious belief that the Universe, Earth and all life on Earth were created by direct acts of God less than 10,000 years ago. Its primary adherents are Christians who subscribe to a literal interpretation of the creation narrative in the Bible's Book of Genesis and believe that God created the Earth in six 24-hour days. In contrast to YEC, old Earth creationism is the belief in a metaphorical interpretation of the Book of Genesis and the scientifically-determined estimated ages of the Earth and Universe.
Since the mid-20th century, young Earth creationists—starting with Henry Morris (1918–2006)—have devised and promoted a pseudoscientific explanation called "creation science" as a basis for a religious belief in a supernatural, geologically recent creation. Evidence from numerous scientific disciplines contradicts YEC, showing the age of the universe as 13.8 billion years, the formation of the Earth as at least 4.5 billion years ago, and the first appearance of life on Earth as occurring at least 3.5 billion years ago.
A 2009 poll by Harris Interactive found that 39% of Americans agreed with the statement that "God created the universe, the earth, the sun, moon, stars, plants, animals, and the first two people within the past 10,000 years", yet only 18% of the Americans polled agreed with the statement "The earth is less than 10,000 years old". Between 1982 and 2014, successive surveys have found that between 40% and 47% of adults in the United States inclined to the view that "God created humans in their present form at one time within the last 10,000 years" when Gallup asked for their views on the origin and development of human beings. A 2011 Gallup survey reports that 30% of U.S. adults say they interpret the Bible literally. These beliefs are often contradictory.