Hi Antwill,
As a Protestant believer, allow me try and answer your questions.
I am busy editing a book on doctrinal diversity and unity within Evangelicalism (although one of the contributors is from the United Catholic Church). My main thesis is that denominationalism is not the root cause of disunity; it is sectarianism. I quote from one of my chapters:
Some Christians have in the past and up to now shown a sectarian attitude, believing that unity means conformity to all their views and “refusing to allow for diversity in others”. They have broadened Christian orthodoxy by breaking fellowship with any other Christian who disagrees with them on non-essential doctrines, which is fuelled by their belief that the Holy Spirit illumines their minds to understand everything that is written in the Bible. There is, however, a subtle danger that all of us must face in our effort for unity. We must be aware that when we apply principles of interpretation, we are approaching Scripture with our presuppositions, influenced by our environment and theological traditions."
Diversity does not equal disunity amongst Protestants. I mean let’s face it, if you are a happy clappy type of Christian, then join a charismatic church! And if you are into the smells and bells, then join an Anglican church! Christian unity is rather to be demonstrated in “saving orthodoxy”; which is the gospel (1 Cor. 15:1ff; Col. 1:15ff). Our unity is further demonstrated in our agreement on the “essential” doctrines of the Christian faith, which is the Trinity & deity of Christ, original sin, and salvation by grace. How we discern between the “essentials” and “non-essentials” of the faith is will also be answered in my book - which hopefully will be published later this year.
Protestant