The relationship between science and religion has typically been characterized as one of conflict, especially on the issue of origins (creationism vs. evolution). The historical reality is that science and religion have more often been complementary to each other, and the relationship has been dynamic. With this definition in hand, he went on to argue that religion and science were inherently incompatible "because they have different methods of getting knowledge about reality, different ways of assessing the reliability of that knowledge, and, in the end, arrive at conflicting conclusions about the universe."