There is quite a difference between "judgement" and "discernment". It is our job to be fruit inspectors and to keep ourselves pure. It is also our job to name sin when we see it. (Ever heard of John the Baptist?) Also Christ and His disciples never seemed to stray away from naming sin when they saw it. Perhaps you could give your spin on the "Let your light shine" and "the salt of the world" speeches by Christ.
Saying that, I am fully aware that we are living in a world filled with sinners who are just fulfilling their job description. Many are overacheivers.
Right. Romans 1 deals with discernment -- which is what I was trying to say when I said it offers guidance to a church.