No, it's "Orthodox Christian" and "Catholic Christian", to differentiate.

philsnow · on March 11, 2020

Conversely, the Catholics I know prefer (if they have a preference, many don't) the bare term "Catholic" rather than "Catholic Christian". This is likely because I live in the US.

stavros · on March 11, 2020

Now that you mention it, I've only heard them called "Catholics" here as well, not "Catholic Christian", so it's "Orthodox" or "Orthodox Christian" and "Catholic", you're right.