Some folks can’t see a distinction between faith and confidence.
I have confidence that a bridge will hold me because I have seen others drive over it. After I have driven over it a number of times, my confidence is increased.
I have confidence in the opinions and statements of certain people due to experience. My level of trust depends on my overall experience with individuals.
The word “faith,” in the context of discussions of science, does not refer to confidence and trust based on experience. It specifically refers to belief in supernatural causation. Same for “religion.”
Then properly considered, "Scientism" is only applicable to people who self-profess a religious belief in science. I don't think I've ever seen anyone actually do that.