That's a very inaccurate headline for the article. More than half of those surveyed not only believe evolution to be true; but believe it 'makes belief in God unnessecary and absurd'. Only 33% of respondents answered that atheistic evolution, making belief in God absurd, was probably or definitely untrue.
It's also worth pointing out that there was no question simply asking if they believed evolutionary theory, as described by modern science, to be accurate. In order to express support for this theory in the survey; one also had to declare God absurd. This didn't put most off, but implies a survey deliberately slanted to overexagerrate support for creationism.
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