Slavery and Evolution
It is always sad to see Christians trying to make themselves seem intellectually or morally superior, but even more so when they attempt to use science to justify their smug haughtiness. Sad, because this attitude is a violation of one of their Seven Deadly Sins (namely pride), which they blithely ignore, even as they go about touting how much better they are because of their Christian values and beliefs. And sad, too, because they reject science whenever they see it as a threat to their belief system, but proudly claim credit for it when they think it will make them look better (as in their claim: It was Christians, not atheists, who invented science). And then there's the misuse of science (or pseudo-science) in a vain attempt to show that their religious beliefs compare favorably to non-theistic scientific theories. Perhaps the most notable example of this is ID science, which doesn't follow the methods of scientific investigation, but sounds kind of sciencey, and that's good enough for them.