"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."Check out the article from the New York Times, titled "Few Biologists but Many Evangelicals Sign Anti-Evolution Petition." This article acknowledges that 128 of the signers are biologists (and that doesn't count biochemists). Here is a part of the article:
"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."So from these 20 random interviews is the extrapolation that few biologists but many evangelicals have signed the petition. In reality, biology is the most represented field in the list.
The article does brings up a good point about how a religious belief can potentially affect one's position on evolution. However, I do not agree with the implicit assertion that a Christian is not fully capable of objectively looking at the evidence. After all, everybody has a prior belief. For instance, the prior belief of an atheist may make him cling to evolutionary theory even more.
For a contrast, see a more objective article.