Dear Forest,
As Michael has suggested, much depends upon what it is we agree upon, and whilst, being fallen sinners all, we have a well-developed (and loud) language in which to express our disagreements, we spend less time telling the world what we agree upon.
St. Paul pointed out that it was possible to have unity in diversity and diversity in unity; we sometimes lose sight of that. So fearful can we become of the idea of 'watering down' the Faith 'once given', that we shy away from anything that would look like syncretism. Yet the differences between us are probably not wider than those facing the Apostles over the issue of whether Gentiles should have to be subject to Jewish law, and whether justification was by faith or by works; they simply showed a little more humility and obedience to the Spirit.
We agree on so much: that Christ is Lord indeed; that He is the only-begotten Son of the Father; that the Spirit proceeds through Him, from the Father into our lives (even if we disagree on the exact procession of the Spirit); that salvation is from God through Him; that He rose from the dead on the third day; that we need to repent, turn from our sins and amend our lives in obedience with His will through His grace and our cooperation with Him.
Some may, at first sight, want to unpick that last paragraph, but I wonder how much of that is because we sometimes use the same language in different ways?
If we could recover St. Paul's sense that diversity of practice within the faith 'once received' is a sign of the richness of life in Christ, and if we could practice that love which Our Saviour called us to, and which St. Paul reminds us is a sign of the Spirit in us, we should do well.
We are, each of us (I hope) obedient to those set in authority above us who pronounce upon sound doctrine, and we must be guided by them; but we can also help guide them through the respect and love we show each for the other. I learn much here, and elsehwere, about the traditions of others, and the more I listen and learn, the more we seem to have in common.
We have the Risen Lord in common. If, like the Holy Apostles themselves, we do not always agree on some matters, then that is further proof of why Christ Jesus came into the world - to save sinners - of whom I am the chief.
In peace,
Anglian