Eighty-two percent of adult Americans said they believe in God, unchanged since the question was last asked by Harris Interactive (NASDAQ:HPOL) in 2005, the company reported Thursday.

The poll found 41 percent of respondents said they believe in ghosts, 35 percent said they believe in extraterrestrials and roughly one-third of respondents said they believe in witches.

The poll of 2,455 U.S. adults conducted online between Nov. 7 and Nov. 13 found that 42 percent of Americans accept Charles Darwin's theory of evolution, while 39 percent believe in creationism.

Among Christians, the poll found that born-again believers are more likely than Catholics or mainline Protestants to believe in the traditional elements of Christianity. For example, 95 percent of born-again Christians believe in miracles, compared to 87 percent of Catholics and 89 percent of Protestants.

Meanwhile, 92 percent of born-again Christians believe in hell, compared to 75 percent of Catholics and 78 percent of Protestants.