If an institution claims to have access to objective truth then it would follow that they should try to use such truth in a way that benefits everyone. This is what religion attempts to do…sometimes.
The problem isn't necessarily in the core tenets of any particularly belief, but the way in which they choose to wield 'truth'. Many religions are dedicated to the idea of self-improvement and concern for your fellow man or woman. Those are the ones that have a chance of doing good, but probability tells us that there are going to be a few bad apples in every basket. That's just something that can't be helped.
Religion should be a voice for good if indeed they possess truth. However, history has shown the contrary in many cases.
