What is Scientism? It is something to be avoided -that's the way I took it.
re: "This is where science clearly steps over into the realm of faith. This is Scientism."

I like science and rely on it as a tool, but statements such as "Science is the ultimate truth," seem to elevate science beyond the status of tool, up to the status of a belief system, Scientism.
Saying, "Science is the ultimate truth," makes people who see ultimate truth elswhere, recoil against science.

At most, I would say 'Science seeks ultimate truth.'

~SA

Pyrolysis creates reduced carbon! ...Time for the next step in our evolutionary symbiosis with fire.