Catholic usually means Roman Catholic (though I try to always use Roman Catholic to avoid confusion). There are certainly differences in doctrine between the protestant churches, the RCC, and the Orthodox church, but most people these days would consider RCCers to be Christian. However, it's by no means a dead issue, and so even people who do consider RCCers Christian, if they've been raised in a more conservative sect, they might still have the linguistic habit of dividing the Church into Christians and Catholics.
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"Die Deutschen meinen, daß die Kraft sich in Härte und Grausamkeit offenbaren müsse, sie unterwerfen sich dann gerne und mit Bewunderung:[...]. Daß es Kraft giebt in der Milde und Stille, das glauben sie nicht leicht."
"The Germans believe that power must reveal itself in hardness and cruelty and then submit themselves gladly and with admiration[...]. They do not believe readily that there is power in meekness and calm."
-- Friedrich Nietzsche
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