is all knowledge science in the meaning of modern science?
Stricly speaking, this depends on one's view. From the view of many - so it seems to me - knowledge that is/was reached by Science has a higher "Standard" and therefore a higher reputation than "common believs" - no matter whether they might be right or wrong. For example it might be common belief in the "effectiveness" of some herbs, but scientists say that they don't belive that - until it's scientifically measured.
So - I would tend to agree with you : That the methods and objects are different ...
By the way, one of the worst cases was that of a company seeing the potential in a herb - and getting a patent or it. It happened. The nativs of that area where that herb origginates from ( I don't remember where it was - Africa ?) knew it - it was "common belief" there. Because the company got a Patent on that herb, in principle the natives there are not allowed to use "thier" herb anymore. Fortunately the company was sentenced in a lawsuit to pay them a part of the money they got for that Patent.
