How to tell if an Atheist is not objective
1) If they quote a worthless study by Gregory S Paul (who draws dinosaurs) which claims that religion is bad for society.
Many atheists claim to be skeptical and rational in their approach. In fact, they oft claim they are more rational and more skeptical that theists.
Yet when it comes to having reviewing evidence that supports their belief system, that rationality and skepticism seems to vanish.
Add PZ Myers to the long list of atheists who have shown their lack of objectivity, and therefore their trustworthiness.