I did say the same to my Protestant friend. But he had an objection like this:
Strong’s greek Dictionary said that:
“kata” = “throughout”
“holos” = “all”
But “catholic” is a word, means “general, universal.”
Based on Henry George Liddell, Robert Scott, A Greek-English Lexicon, the word “katholikos” comes from “katholou” (=“in general”) and “holikos” (=“universal”)
So the phrase “kata holos” is different from “katholikos.”
The term “catholic church” used for the first time by Constantine on 313 AD in Edict of Milan (tolerance of religious), i.e. “One Holy Catholic” or “katholou and holikos.”
How can I answer him?
Actually, your friend is wrong about the second.
Best way to refute him is to show his error:
"Wherever the bishop shall appear, there let the multitude [of the people] also be; even as, wherever Jesus Christ is, there is the Catholic Church. "
“The Church of God which sojourns at Smyrna, to the Church of God sojourning in Philomelium, and to all the congregations of the Holy and Catholic Church in every place: Mercy, peace, and love from God the Father, and our Lord Jesus Christ, be multiplied.”
“Now, as soon as he had ceased praying, having made mention of all that had at any time come in contact with him, both small and great, illustrious and obscure, as well as the whole Catholic Church throughout the world, the time of his departure having arrived, they set him upon an a s s, and conducted him into the city, the day being that of the great Sabbath.”
(note: the word for donkey above is straight out of the text – it was written in that fashion so that it would pass the language filter on the site)
“At length, when those wicked men perceived that his body could not be consumed by the fire, they commanded an executioner to go near and pierce him through with a dagger.And on his doing this, there came forth a dove, and a great quantity of blood, so that the fire was extinguished; and all the people wondered that there should be such a difference between the unbelievers and the elect, of whom this most admirable Polycarp was one, having in our own times been an apostolic and prophetic teacher, and bishop of the Catholic Church which is in Smyrna.”
“For, having through patience overcome the unjust governor, and thus acquired the crown of immortality, he now, with the apostles and all the righteous [in heaven], rejoicingly glorifies God, even the Father, and blesses our Lord Jesus Christ, the Saviour of our souls, the Governor of our bodies, and the Shepherd of the Catholic Church throughout the world.”
I believe that the word “Catholic Church” was originally used to distinguish the universal Church vice a particular Church (e.g., the Church at Smyrna, the Church at Corinth). However, it took on additional significance with heretical movements (such as the one started by Marcion). Catholics would be distinguished from Marcionites.