QuoteYes, it would be easier if there were actually a philosopher or scientist who said "I am am advocate of "Scientism" and this is what it means.
As it is (or at least as i understand it) nobody actually advocates such a position.
There are quite a few people who habe been labelled advocates of Scientism by others or themselves, e.g.:
Auguste Comte (positivist philosopher, apparently without using the term "Scientism")
Peter Atkins (reported to have asserted the “universal competence” of science in his essay “Science as Truth”, 1995)
James Ladyman, Don Ross, and David Spurrett (reportedly in their book "Every Thing Must Go: Metaphysics Naturalized", 2007)
Alex Rosenberg
Don Ross