Would you say that Christ Himself was a Catholic?
Yes. The Founder of the Catholic Church was certainly a Catholic, and history proves that Christ founded the Catholic Church, and identified it with Himself. Thus St. Paul says, “God hath made Him head over all the church (not churches) which is His body, and the fullness of Him who is filled all in all.” Eph. I., 22-23.
Catholicity, Question 504 from Radio Replies Volume I Copyright © 1938 (by Rev. Dr. Leslie Rumble, M.S.C. and Rev. Charles Mortimer Carty).