I know you do believe that Jesus Christ is Lord, God and Savior — you, esquirette are a Presbyterian and believe in the tenets of the Nicene Creed, correct?
The Nicene Creed has that one line about one holy catholic and apostolic church, and the definitions of what those terms mean is where we differ, and probably will continue to differ. At the same time, there are other mysteries that the Lord will make clear one day, and are not worth endless disputations for which we must give account on that Day. His sheep know His voice.