Since the vast majority of Copts (probably over 95% of them) were baptized as babies as never went around telling people when they were "saved" and "started a personal relationship with Jesus Christ", I guess they're "not Christians", according to some of our evangelical protestant friends. Just applying their logic.
And we have many Evangelical friends here.
Haven't had much time to think of a suitable new label. Plenty of snarky ones pop up in my mischievous brain, but no need to add to the total amount of snark in the Universe.
How about "the More Bumptious Brethren"? I don't think anyone takes serious offense at "bumptious". Hmm. The MBB's.