Never heard that here in Brazil.Weird...in Italy we say "Not all Catholics are Christian"
I take it that the saying means that Catholicism is often a received cultural tradition, and it should not be assumed that the recipients believe in Christianity?
If that is what is meant, then I can give personal testimony that the saying is quite correct.
As for the OP: there is no convenient, objective standard to decide who counts as Christian. Many of the best criteria are not suitable for sweeping generalizations over entire denominations, either.
I can't really think of any reasonable criterium that would single out Roman Catholicism as non-Christian, in any case.
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