I probably shouldn't jump into an Anglican - Roman squabble, but here goes: What constitutes the "Catholic" faith was defined in the athanasian creed 1,600 years ago. A number of orthodox Christian denominations subscribe to the Athanasian Creed and deny to any one denomination, including the Roman Catholic Church the right to limit or expand it.
You wrote:
" A number of orthodox Christian denominations subscribe to the Athanasian Creed and deny to any one denomination, including the Roman Catholic Church the right to limit or expand it."
The Catholic Church is not a denomination. I am Catholic. I am not Roman.