The Responsibility to Condemn

Here's a question for you -- let's say there's a world religion that we'll call "X." The creed of that religion is, so they say, "treat others as you wish to be treated yourself." Now let's say a slim minority of "X" finds a way to justify the murder of innocents in the name of "X."

Does the majority of "X" have a moral obligation to condemn the actions of the few?

If they in fact do not condemn the few, what are we then to think of "X?"

If the majority steadfastly refuses to condemn the few, is there a point in time when we may look upon "X" as not abiding by their own creed? May we then condemn all of "X?"

Those are very serious questions.