Kashrut

Question

I have a rabbi whom I follow for everything. Thus I eat OU cheese, carry in the eruv and don't eat gelatin (opposite of what your position is). However, my rabbi is very adamant that all food must have a hekhsher and he has a list of acceptable hekhsherim. If I don't listen to him in this regard am I being inconsistent? If not, what then do you mean when you say that we should find a rabbi and stick with him? Perhaps you are only referring to matters of halakhah where there is a difference of opinion between your rabbi and someone else, but this rabbi thinks what he is saying is also halakhah.