Semantics are so tedious.
I could not care less whether some field of knowledge should be labeled as science or not. Few things interest me less. Maybe my definition of science is broader than it ought to be? I don't care.
The point is that it is entirely reasonable to demand evidence for the extraordinary claims of theists.
It is irrelevant whether that evidence belongs in the realm of science or not. Theists insist god acts in the physical world. That is open to investigation. Dismissing such reasonable requests as "scientism" is a cop-out.