See, this is the problem - you say that the majority of the sciences use the scientific method, which implies that some of them don't and this is impossible. That's why we have the division of "soft" sciences (social, political and economics) and "hard" sciences (Physics, Chemistry, Biology, Planetary Science, Astronomy, etc.). The former are not sciences at all because they do not adhere to the method, but we are stuck with the name, because the word science initially was not used to describe what we mean by "science" today. Only those practices that stick to the hardcore scientific method can be considered science, the rest isn't.
I am not coming at you, I just want to clear up the misunderstanding of some fundamental concepts that I see