What is scientism?

In this article I try to define more precisely what scientism is and how it is related to a traditional religion such as Christianity. By first examining the writing of a number of contemporary natural scientists (Francis Crick, Richard Dawkins, Stephen Hawking, Carl Sagan and Edward O. Wilson), I show that the concept can be given numerous different meanings. I propose and defend a distinction between epistemic, rationalistic, ontological, axiological and redemptive scientism and it is also explained why we should not directly identify scientism with scientific materialism or scientific naturalism