Only proves he knows nothing of either Catholicism or Islam.
Funny, when I was in Istanbul two summers ago, I didn’t have the same reaction. My guide spent the day “quizzing” me on Christianity. He said that Muslims knew more about Christianity than Christians did - that we were ignorant and weak. Glad I paid attention in Sunday School and Bible Study so I could at least defend my faith with facts and logic. When he realized that I wasn’t going to back down, He said, “first we ask you nicely to join us. Then we tax you. Then we kill you”. The quote is verbatim. I can’t imagine not wanting to be part of that!!! Needless to say, he didn’t get a tip :-)