I think some Protestants have a narrow view of what it takes to be a Christian, and all those who don’t believe likewise are not Christian, in their minds. For example,
gotquestions.org/catholicism.html
I don’t adhere to that perspective. I certainly believe that Catholics are my brothers and sisters in Christ and that Catholicism existed long before my faith tradition ever did. That is why I joined CAF in first place, in order to enhance my overall faith in Christ and learn from Catholics and other Christians.
However, I am sometimes puzzled by the following.
Usually, when I hear a non-Catholic respond to the question, “Are you a Christian?”, they simply reply “Yes”. They usually don’t say they are a Baptist, Methodist, Presbyterian, etc unless there is a follow-up question asking then what denomination they belong to. They simply respond, “Yes” to the question.
When I hear a Catholic respond to the same question, most of them respond, “I’m Catholic”. I wonder why they just don’t say, “Yes”, or Yes, I am a Catholic Christian" or something to that effect.