Four out of ever 10 people in the U.S. believe God created the Earth less than 10,000 years ago, according to a new Gallup poll. About half of Americans believe humans evolved alongside other species over millions of years, with the majority of those people saying God guided the process. Although the percentage of people who believe in creationism has changed little over the decades, the percentage of people who believe humans evolved without God has more than doubled. Gallop asked a random sample of 1,028 people about their views for the Values and Beliefs Survey. Almost all scientists who study human origins believe humans evolved over millions of years.