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In the recent skirmishes over evolution, advocates who have pushed to dilute its teaching have regularly pointed to a petition signed by 514 scientists and engineers.

　　The petition, they say, is proof that scientific doubt over evolution persists. But random interviews with 20 people who signed the petition and a review of the public statements of more than a dozen others suggest that many are evangelical Christians, whose doubts about evolution grew out of their religious beliefs. And even the petition's sponsor, the Discovery Institute in Seattle, says that only a quarter of the signers are biologists, whose field is most directly concerned with evolution. The other signers include 76 chemists, 75 engineers, 63 physicists and 24 professors of medicine.

　　The petition was started in 2001 by the institute, which champions intelligent design as an alternative theory to evolution and supports a "teach the controversy" approach, like the one scuttled by the state Board of Education in Ohio last week.

　　Institute officials said that 41 people added their names to the petition after a federal judge ruled in December against the Dover, Pa., school district's attempt to present intelligent design as an alternative to evolution.

　　"Early on, the critics said there was nobody who disbelieved Darwin's theory except for rubes in the woods," said Bruce Chapman, president of the institute. "How many does it take to be a noticeable minority — 10, 50, 100, 500?"

　　Mr. Chapman said the petition showed "there is a minority of scientists who disagree with Darwin's theory, and it is not just a handful."

　　The petition makes no mention of intelligent design, the proposition that life is so complex that it is best explained as the design of an intelligent being. Rather, it states: "We are skeptical of claims for the ability of random mutation and natural selection to account for the complexity of life. Careful examination of the evidence for Darwinian theory should be encouraged."

　　A Web site with the full list of those who signed the petition was made available yesterday by the institute at dissentfromdarwin.org. The signers all claim doctorates in science or engineering. The list includes a few nationally prominent scientists like James M. Tour, a professor of chemistry at Rice University; Rosalind W. Picard, director of the affective computing research group at the Massachusetts Institute of Technology; and Philip S. Skell, an emeritus professor of chemistry at Penn State who is also a member of the National Academy of Sciences.

　　It also includes many with more modest positions, like Thomas H. Marshall, director of public works in Delaware, Ohio, who has a doctorate in environmental ecology. The Discovery Institute says 128 signers hold degrees in the biological sciences and 26 in biochemistry. That leaves more than 350 nonbiologists, including Dr. Tour, Dr. Picard and Dr. Skell.

　　Of the 128 biologists who signed, few conduct research that would directly address the question of what shaped the history of life.

　　Of the signers who are evangelical Christians, most defend their doubts on scientific grounds but also say that evolution runs against their religious beliefs.

　　Several said that their doubts began when they increased their involvement with Christian churches.

　　Some said they read the Bible literally and doubt not only evolution but also findings of geology and cosmology that show the universe and the earth to be billions of years old.

　　Scott R. Fulton, a professor of mathematics and computer science at Clarkson University in Potsdam, N.Y., who signed the petition, said that the argument for intelligent design was "very interesting and promising."

　　He said he thought his religious belief was "not particularly relevant" in how he judged intelligent design. "It probably influences in the sense in that it makes me very interested in the questions," he said. "When I see scientific evidence that points to God, I find that encouraging."