As well as taxes and death, the other thing that is certain about being a human being is that we will disagree with each other. This seems to be as true of people of faith. Some people see this as a sadness, a sign of weakness. I used to believe this, but it seems inevitable that human beings will have different beliefs, values, ideals.
What seems more important is how we disagree. Surely no matter how fundamental the principle we disagree over, we can and must always be loving. To relate to someone respectfully is not as sign that we agree with them or condone their beliefs or behavior, it is how all human beings, people of faith, religious leaders should act towards one another.
In ethics there is a term called first principles, what is the most important way to act. Love and grace are the primary principles we apply and use to work out our disagreements. This could be an even better witness than agreeing with each other.