Not a denomination?
Oh, really?
Says who?
Sounds like blacks, caucasians and Orientals denying that they are members of their race.
OK, substitute the following for "denomination:"
"All organized formal Christian groups with any hierarchical leadership to any significant degree at all."
Anything reasonable to spare a fellow FREEPER the blackboard torture.
Says the Catholic Church, that's who!
Denominationalism is an ideology which views some or all Christian groups as being, in some sense, versions of the same thing regardless of their distinguishing labels. Not all churches teach this. The Roman Catholic and Orthodox Churches do not use this term as its implication of interchangeability does not agree with their theological teachings.
And...
The term denomination was innovated in the late seventeenth century by those groups of Christians in England who dissented from the established Church of England but considered themselves to be entirely loyal to the British state and recognized the monarch as having rights with respect to the Church of England.