Ironically, you are appealing to Scripture, or your interpretation of Scripture, to define what "one Lord, one faith, one baptism" is and to disallow Scripture as the final authority on spiritual matters.
What exactly does "one Lord, one faith, one baptism" mean? And whose interpretation is it and how can we know that is valid?
And who's going to interpret the interpretation for us?
Unity of Christian doctrine is something that will never happen in the organized religion concept. Every one of them is speaking carnally and will never approach the true meaning of the “church” that started when Israel was set aside until the end times.