Well now you're getting into absolute certainty, which is not possible, and I agree. But in general, that's not the way they mean it and you know it. They're perfectly happy using what science is available to them and when it conflicts with their world view, they ignore it.
"The way to see by faith is to shut the eye of reason." Benjamin Franklin
::Blogs:: Boston Atheism Examiner - Boston Atheists Blog | :odcast:: Boston Atheists Report
::Blogs:: Boston Atheism Examiner - Boston Atheists Blog | :odcast:: Boston Atheists Report