[Dr. Eckleburg]

I would propose that the most accurate differentiations would be to use "catholic" and "Catholic" as opposed to "Catholic" and "Roman Catholic" as you described.

Seem like more RC usurpation of the language.

How about "christian" for Roman Catholics" and "Christian" for Protestants?

[GCC Catholic]

Seem like more RC usurpation of the language.

Hardly, though I did give justification for my terms. Besides, I can't force you to use it.

How about "christian" for Roman Catholics" and "Christian" for Protestants?

On what grounds? Catholics and Protestants consider each other to be Christian.