Some of them do know more, of course. Not all of them will, though, if that's not an area they come into contact with in their daily practice.
And it's good that you don't have blind faith. A lot of people do have blind faith in doctors, because they think they have to adhere to a Hippocratic Oath, or think that they're somehow morally or ethically more trustworthy than the average person, when really neither of those things is true.