Catholics are Christians, but Christians are not necessarily Catholic. For example, Orthodox Christians are not Catholic. Being Catholic requires, at the bare minimum, agreement with the Holy See and implicitly the dogma he endorses. Even this “minor” difference can be used to find non-Catholic Christians.
I know that, but if you ask me, it's like saying Sunni and Muslim, one kinda emphasizes, if not "otherizes" (orientalize or occidentalize) the other... usually in a not good way...
Now, that's a colorful right there
Why wouldn't we want more Napoleons tho?