I agree...The name Christian has been so watered down that it has practically lost its meaning...
There are however religions out that that do very nicely without the bible...And then we have those who don't rely on the scriptures but use random verses to add an air of legitimacy to their claim of Christian...
I understand your point (I think) about quoting random verses,i.e., something that is not really pertinent to the point the person is attempting to make.
Otherwise though quoting a single verse and showing its relevance seems quite proper and desirable at times. We stand in good company when doing so.